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The 30°-60°-90° triangle. Topics in trigonometry....喜歡? 不認真看還真的看不出來... 特別的男人? 哈哈哈!這讓小編大笑! 史奴比粉絲會生氣喔...= = 買東西時還是要睜大眼睛~差一點可是差很大喔!The ratios of the sides in a 30-60-90 triangle. How to solve a 30-60-90 triangle. ... Problem 10. Prove: The angle bisectors of an equilateral triangle meet at a point that is two thirds of the distance from the vertex of the triangle to the base....
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