Question

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Answer 1

Answer:

(i) diameter = 35 cm

radius = 35/2 cm

perimeter = circumference = πr = 22/7 × 35/2

55cm

(ii) circumference of semicircle = πr = 22/7 × 14/2

= 22 cm

circumference of 2 circles = 44 cm

total perimeter = 44 + 20 + 20 = 84 cm

Answer 2

here is your answer mate

The perimeter of a circle is π × d where d is the diameter so half of that is 1/2 π × d. But If you are going to walk around a semicircle you need to go half way around the circle and then across a diagonal to get back to where you started so the perimeter is 1/2 π × d + d.

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