题目内容：

如图,一个半圆的直径AB=16cm,那么这个半圆的面积与周长各是多少?分别精确到0.01cm2,0.01cm

优质解答

半径 r = 16 ÷ 2 = 8 cm
面积 S = πr²÷ 2 = 3.14 × 8 × 8 ÷ 2 = 100.48 cm²
周长 = πr + 2r = 3.14 × 8 + 2 × 8 = 41.12 cm