WAEC - Mathematics (1989 - No. 16)
An arc of a circle radius 7cm is 14cm long. What angle does the arc subtend at the center of circle?
[Take π = 22/7]
[Take π = 22/7]
25.7o
44o
51.43o
98o
114.55o
설명
L = 14cm, r = 7cm; \(\theta\)= ?
L = \(\frac{\theta}{360}\) x 2πr
14= \(\frac{\theta\}{360}\) x 2π(7)
\(\theta = \frac{360 \times 14}{44}\)
=114.55°