Consider the rectangle ABCD below .E is point on CD such that AE=3,BE=4 and AE⊥BE.The area of rectangle ABCD is ________.（要有具体过程,）

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Consider the rectangle ABCD below .E is point on CD such that AE=3,BE=4 and AE⊥BE.The area of rectangle ABCD is ________.（要有具体过程,）
Consider the rectangle ABCD below .E is point on CD such that AE=3,BE=4 and AE⊥BE.The area of rectangle ABCD is ________.（要有具体过程,）

Consider the rectangle ABCD below .E is point on CD such that AE=3,BE=4 and AE⊥BE.The area of rectangle ABCD is ________.（要有具体过程,）
思考下面的这个长方形ABCD.E是CD上的一点,且 AE=3,BE=4,AE⊥BE.求长方形ABCD的面积.
长方形ABCD的面积=ABXAD
AD=三角形ABE的高
三角形ABE的面积=1/2ABX高
所以长方形ABCD的面积=三角形ABE的面积X2
三角形ABE的面积=1/2AExBE
长方形ABCD的面积=AExBE=12

在矩形ABCD中，E点在CD上，AE=3, BE=4 且 AE⊥BE. 求矩形ABCD 的面积是3*4=12
三角形ABE是直角三角形，面积=0.5AE*BE
矩形ABCD 的面积三角形ABE面积的2倍，矩形ABCD 的面积=AE*BE=3*4=12

三角形ABE面积为 3*4/2=6 （三角型面积公式能看懂吧）
矩形ABCD面积为三角形ABE面积二倍你可以把三角形BCE和三角形ADE拼起来看即构成三角形ACE 三角形ACE和三角形ABE底相同高相同所以面积相等呵呵希望看明白

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