No 8,9,10 gimana yaa?? Tolong dijawab yaa.. Makasih...

8. L = π × r²
616 = 3,14 × r²
r² = 616 ÷ 3,14 = 196,1
r = √196,1 = 44,28318

9. 75,36 ÷ 3,14 = 24
√24= 4,898979

10. 1017,36 : 3,14 = 324
√324 = 18 (r)
18 × 2 = 36 (d)

sorry kalau salah

8) L = phi × r2
616 = 22/7× r2
616 : 22/7 = r2
616 × 7/22 = r2
196 = r2
14 cm = r

10) L = phi × r2
1017, 36 = 3,14 × r2
1017,36 : 3,14 = r2
324 = r2
18 = r
diameter = 18 × 2 = 36 cm