WAEC - Mathematics (1997 - No. 17)
Find the radius of a circle in which an arc of length 44cm subtends angle 200° at the centre of the circle. [Take π = 22/7]
3.9cm
12.6cm
25.2cm
38.4cm
124.5cm
Giải thích
44 = 200/360 x 2 x 22/7 x r
r = 360 x 7 x 44/200 x 2 x 22
= 12.6cm