passwella.
Menu

WAEC Further Mathematics 2012 Question 40

Question 40

Trigonometry

The angle of a sector of circle is 0.9 radians. If the radius of the circle is 4cm, find the length of the arc of the sector.

  1. A.3.6cm
  2. B.7.6cm
  3. C.8.0cm
  4. D.11.6cm
Show the answer and explanation

Answer: A (3.6cm)

Explanation

Arc length = rθ = 4 × 0.9 = 3.6 cm.