WAEC - Further Mathematics (2012 - No. 35)
The angle of a sector of a circle is 0.9 radians. If the radius of the circle is 4cm, find the length of the arc of the sector.
3.6 cm
7.6 cm
8.0 cm
11.6 cm
설명
Length of arc given angle in radians = \(r \theta\)
= \(4 \times 0.9 = 3.6 cm\)