JAMB - Mathematics (2016 - No. 23)
Calculate the perimeter of a sector of a circle of raduis 9cm and angle 36o.
18cm
(18 + \(\frac{9\pi}{5}\))cm
(9 + \(\frac{9\pi}{5}\))cm
\(\frac{9\pi}{5}\)cm
คำอธิบาย
Perimeter = 2r + \(\frac{\theta}{360}\) x 2\(\pi\)r
2(9) + \(\frac{36}{360}\) x 2 x \(\pi\) x 9 = 18 + \(\frac{9\pi}{5}\)
2(9) + \(\frac{36}{360}\) x 2 x \(\pi\) x 9 = 18 + \(\frac{9\pi}{5}\)