JAMB - Mathematics (2005 - No. 26)
A chord of a circle subtends an angle of 60o at the length of a circle of radius 14 cm. Find the length of the chord
7 cm
14 cm
21 cm
28 cm
Giải thích
Chord Length (L) = \(2 \times Radius \times (sin \frac{angle}{2})\)
= \(2 \times 14 \times (sin \frac{60}{2})\)
= \( 28 \times (sin 30)\)
= \(28 \times \frac{1}{2}\)
= \(14cm\)