Tolong Dijawab beserta Caranya

Pembahasan :
Diameter lingkaran
= K ÷ phi
= 314 cm ÷ 3,14
= 100 cm

Jari jari lingkaran
= 100 ÷ 2
= 50 cm

Luas juring OPQ
= 72°/360° × phi × r × r
= 1/5 × 3,14 × 50 × 50
= 1570 cm^2

Good Luck ^^

Jawab :

r = 3,14 . 314
  = 10 cm

L.juring OPQ = 72°/360° . 3,14 . 10 . 10
                      = 1/5 . 3,14 . 10 . 10 
                      = 62,8 cm