WAEC - Mathematics (1994 - No. 31)
A circle has radius x cm. What is the area of a sector of the circle with angle 135°, leaving the answer in terms of x and π?
\( \frac{\pi x^2}{8} \)
\( \frac{3\pi x^2}{8} \)
\( \frac{5\pi x^2}{8} \)
\( \frac{3\pi x}{8} \)
説明
A = θ 360 x πr2 = 135 360 x π x x2 = (3πx2)/8