Question

Lingkaran pusat O berjari jari 20cm. sudut POQ = 72 derajat. luas juring POQ adalah..

Answer 1

Diket:
r = 20cm
< POQ = 72'
Dit: L juring POQ....?
L juring POQ = α/360 x L lingkaran
L juring = 72/360 x πr²
L juring = 72/360 x 3,14 x 20²
L juring = 1/5 x 1256
L juring = 251,2 cm²