tolong jawab no 8&9

no 8=> °/360°xπr²
=>60°/360°x22/7x7x7
1/6x154=25,66
no 9=> L tembereng = L Juring-L segitiga
=>L juring=°/360°xπr²
=90°/360°x3,14x10x10
=1/4x314=78,5
=>L segitiga = a x t:2
= 10x10:2=50
jadi,L tembereng= L juring-L segitiga
= 78,5-50 =28,5