jari jari 100 cm π 3,14 panjang busur 31,4 berapakah sudut pusatnya

jawab

r= 100 cm
pi = 3,14
Pb = 31,4

Pb = a/360 x keliling ling
31,4 = a/360 x 2 pi r
31,4 = a/360 x 2 x 3,14 x 100
10 = a/360 x 200
a/360 = 10/200 = 1/20
a= 360/20
a = 18