Calculate, correct to 2 significant figures, the length o...
Calculate, correct to 2 significant figures, the length of the arc of a circle of radius 3.5cm which subtends an angle of 75° at the centre of the circle. [Take π = 22/7].
2.3cm
4.6cm
8cm
16cm
16cm
Correct answer is B
Length of arc = θ360×2πr
= 75360×2×227×3.5
= 4.583cm
≊ 4.6 cm (to 2 sig. figs)