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一、填空题1.已知两条线段长分别为5cm,12cm,则当第三边平方为时这三条线段构成直角三角形.2.如图1,一个直角三角形与一个半圆拼接在一起,其中,半圆的直径等于直角三角形斜边长,直角三角形两条直角边都等于4,那么半圆的面积=3.图.(2结是果20保02留年π)8月在北京召开的国际数学
First, fill in the blanks 1. Know that the length of the two line segments is 5cm, 12cm, then when the third side of the square is the three line segments constitute a right triangle. 2. Figure 1, a right triangle and a semicircle spliced together, where The diameter of the semicircle is equal to the length of the hypotenuse of the right-angled triangle, and the right-angled triangle has two equal-angled sides equal to 4, and then the area of the semicircle is equal to 3. Figure. (2 is the result of the 20-year-old maintenance 02 retention period π) International mathematics held in Beijing in August