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WAEC Mathematics 2019 Paper

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Question : 25

Total: 50

An arc subtends an angle of 72

^{\circ}

at the centre of a circle. Find the length of the arc if the radius of the circle is 3.5 cm. [Take

\pi = \;\frac{22}{7}

]

6.6 cm
8.8 cm
4.4 cm
2.2 cm

Solution:

Length = $\;\frac{\theta}{360}$ x 2 $\pi$ r

= $\;\frac{72}{360} \times 2 \;\frac{22}{7} \times \;\frac{0.5}{3.5}$

= 4.4

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