tolong dikerjakan ya

16) dik:
L = 2.464 m²
dit:
r =...?

jawab :

L= (phi). r²
2464 = 22/7 . r²
2464 x 7 = 22.r²
17248 = 22.r²
r² = 17248 / 22
r² = 784
r = 28 cm.

17) dik:
r = 3,5 cm
dit:
K=...?

jawab:
K = 2.(phi).r
K = 2. 3,14. 3,5
K = 21,98
= 22 cm.