JAMB - Mathematics (2007 - No. 34)
Calculate the length of an arc of a circle diameter 14 cm, which substends an angle of 90o at the center of the circle
\(\frac{7π}{2}\) cm
7π cm
14π cm
\(\frac{7π}{4}\) cm
Explicació
Length of an arc = \(\frac{θ}{360}\) x 2πr
\(\frac{90}{360}\) x 2 x π x 7
= \(\frac{7π}{2}\)cm\(^2\)
\(\frac{90}{360}\) x 2 x π x 7
= \(\frac{7π}{2}\)cm\(^2\)