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[高中数学]直线倾斜角、斜率，为什么直线垂直k1·k2=-1？
平面解析几何3/20
![[高中数学]定比分点定理，距离公式，中点公式](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/03c0239577994cfaa0edbf61b9f96c84~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20240617204923885657D142F778C3CE21&requestFrom=704&version_code=80402&x-expires=1750164564&x-signature=wdStFZahWv0N%2BrZVSSsSxAVK1nk%3D)
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App09:21![[高中数学]直线倾斜角、斜率，为什么直线垂直k1·k2=-1？](http://p26-sign.bdxiguaimg.com/tos-cn-i-0004/b22359079e94487b81fad02110643e8a~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20240617204923885657D142F778C3CE21&requestFrom=704&version_code=80402&x-expires=1750164564&x-signature=hDhnMclXQ2zEANzDWDnmGpovJ1I%3D)
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