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[今日一题]114：几何专题，求度角？
[今日一题]114：几何专题 如图△ABC中，已知D为AB的中点，∠A=15°,∠B=30°， 求∠BCD是多少度角？看似很简单，应该怎么做呀，大家帮忙解答一下思路！万分感谢，祝大家天天开心，事事顺心，谢谢！
今日一题几何专题15/18
App01:00![[今日一题]101:求三角形面积？](http://p3-sign.bdxiguaimg.com/tos-cn-i-0026/o4UHDCG7gQlpAQEClAgOvk8fBOAfC8biC9AQnA~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=6dzPmk0gEOC1hJtu8LYcFhBOcms%3D)
App01:01![[今日一题]102:求三角形面积？](http://p26-sign.bdxiguaimg.com/tos-cn-i-0026/o8AwAtKvzADlfA2BLwh1GKEBeCCIUDCgLdpToA~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=V%2FWfjDhiDc1yGlt0l%2F8x91NZ3uw%3D)
App01:02![[今日一题]103,几何专题，求角B是多少度角？](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/oshAICANV7uEBDARbteluAfviAQz7DgAAbObyC~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=V27q9OHkNuxmzLLqdhGEInPdVSg%3D)
App01:09![[今日一题]104：几何专题，求角C是多少度角？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/d2be4f9979f94971bc40e4c8e3106a58~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=9N9Yovl%2BTYliCEi%2BDYqRNsqQwNI%3D)
App01:06![[今日一题]105：已知S△BOE=8,S△BOC=20,S△COF=10,求AEOF面积?](http://p26-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/c66b012db6894a9b88df9f2535186896~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=ebZ3T%2BNHaa756VQ0wzFVO6Hk0cY%3D)
App01:06![[今日一题]106：几何专题，数学趣题，求梯形ABCD的面积？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/108b5c0e88704f16b9ac1391055da24d~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=SRjtNg4FFj4yN7aBclJzahL7Fq8%3D)
App01:06![[今日一题]107题，几何专题，求矩形面积是多少？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/795f8926e9d3438f8f7c52348fb011e6~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=mphqhHiYzH%2FYBtB9phjOD%2B17hIg%3D)
App01:04![[今日一题]108：几何专题，求阴影部分面积是多少？蝴蝶模型](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/2ebfe7f02b0b44d992fa83ce118b5f33~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=UOwKa6NtfmShiFevKIZFRJHp4uw%3D)
App01:07![[今日一题]109：几何专题，燕尾模型求四边形ABCD面积是多少？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/3471d8d32b804f67af307af75f6df934~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=qqpw90MXX8n18m2ErF1yqcNlO5A%3D)
App01:07![[今日一题]110：几何专题，求△ADE面积是多少？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/744d281f5508442381083c08f2f63c1c~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=9ROtnCTZSoFVNrP7Zt2NRGcG%2FZE%3D)
App01:03![[今日一题]111：几何专题，求矩形ABCD面积是多少？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/55f6ba7318614660963207f33a83f6f2~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=ITbFr3G8%2F9Ilg5h7zufjM2iULTw%3D)
App01:03![[今日一题]112：几何专题，求∠B是多少度角？@](http://p26-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/f1a9c6dd28084260a77dc4caaa523536~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=ZiMLFO%2F%2Fe9uOHbMamqctBLXF7xM%3D)
App01:03![[今日一题]113：几何专题，求阴影部分面积是多少？](http://p26-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/94db7001574341cca50d22ec4f1b5551~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=86RehuTN7Nb4mZbHQc5ZJ58N6Ys%3D)
App01:22![[今日一题]114：几何专题，求度角？](http://p26-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/ca1c7b157db641948668a3fc5f69331f~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=44qG4mYTNdngNgAE8xjmC%2FcPJ%2F4%3D)
App01:03![[今日一题]115：几何专题，求∠B是多少度角？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/ce7d8effdd1e4758b80e06f1d017b719~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=KiOmZFoyS3WoPwkG3%2FPVYnkhtB4%3D)
App01:03![[今日一题]116：几何专题，求四边形ABCD的面积是多少？](http://p3-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/9bf6965b89eb4db3a4f9d0f7866fac53~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=DW98R866O85LHpVDnVYvIdOw%2BO4%3D)
App01:04![[今日一题]117：几何专题，求阴影部分面积是多少？](http://p26-sign.bdxiguaimg.com/tos-cn-i-pk90l89vgd/a789e653d64244f99a2ae09b0c5d403e~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=202501050858543351CF15A9D235E422DE&requestFrom=704&version_code=80402&x-expires=1767574735&x-signature=sva1yk44udPmcvg4jbuoYPIRBBs%3D)
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