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設角A為X,則角B為2X,角C為3x 因為三角形內角和為180° 所以:X+2X+3X=180° 解得:x=30° 所以:2x=60°,3x=90° 所以這個三角形是直角三角形 所以根據畢氏定理a的二次方+b的二次方=c的二次方 所以所以三角形的面積為:3/2
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