Question

A piece of wire 144 cm long is
bent to form a semicircle as
shown in the figure. Find the
diameter of the semicircle, giving
your answer in metres. (Take a to be 22/7​

Answer 1

Length of wire = 144 cm

Therefore circumference of semicircle = 144 cm

Circumference of semicircle = pi × radius

= 22\7 × r

144 cm = 22/7 × r

r = 144× 7/22 = 6.86 metres

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