阴影区域的真正问题
中间阴影部分的面积=4？-4{4?πx360 /30 -[4？π/4-4?πx360 /30 -(4x2√3)/2]}
=16-4[4π/3-(4π-4π/3-4√3)]
=16-4(4√3-4π/3)
=16-16√3+16π/3
=16(1-√3+π/3)
=16(1-1.73+1.05)
=16x0.32
=5.12(平方厘米)
答:阴影面积为5.12 cm2。？
各部分对应的区域如图所示:
=16-4[4π/3-(4π-4π/3-4√3)]
=16-4(4√3-4π/3)
=16-16√3+16π/3
=16(1-√3+π/3)
=16(1-1.73+1.05)
=16x0.32
=5.12(平方厘米)
答:阴影面积为5.12 cm2。？
各部分对应的区域如图所示: