Find the surface area of a hand held fan (modeled with negligible depth) with radius 8 cm and a 60 degree angle at the centre
60 degrees = π/3 radians
A = 1/2r2θr = 8θ = π/3
1/2 x 82 x π/3 = 33.5103216... cm233.5103216... x 2 = 67.0 cm2 to 3 s.f.
Related Maths A Level answers
All answers ▸Find, in radians, the general solution of the equation cos(3x) = 0.5giving your answer in terms of pi
Find the exact solution of the following equation: e^(4x-3) = 11
Find the gradient of the line with equation 2x + 5y = 7
Write tan(3x) in terms of tan(x). Hence show that the roots of t^3 - 3t^2 - 3t + 1 = 0 are tan(pi/12), tan(5pi/12) and tan(3pi/4)