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题目图1中半圆的面积是15.7平方厘米,你能求出长方形ABCD的面积吗?分析与解:观察图1可知,长方形与半圆
Problem Figure 1, the semicircle area is 15.7 square centimeters, you can find the area of a rectangular ABCD do? Analysis and solution: Observation of Figure 1 shows, rectangular and semicircle