Question

If an arc makes an angles of 72 at the centre of a circle of radius 10cm, then its lenght is
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Answer 1

Step-by-step explanation:

length of arc is given by =

theta

$\frac{theta}{360} \times 2\pi \: r$

therefore here theta =72°

and radius is 10cm

inserting in formulae

72/360×2×22/7×10=88/7=12.57(approx)