设高向下x米到圆心,则x²+3²=(x+2)²
解得:x=5/4
半径:2+5/4=3.25(米)
3/3.25=0.9231
查表得:67.4°,圆心角:67.4×2=134.8°
圆周长:3.25×2× π=20.41(米)
弧长:20.41×134.8/360≈7.64(米
设高向下x米到圆心,则x²+3²=(x+2)²
解得:x=5/4
半径:2+5/4=3.25(米)
3/3.25=0.9231
查表得:67.4°,圆心角:67.4×2=134.8°
圆周长:3.25×2× π=20.41(米)
弧长:20.41×134.8/360≈7.64(米