Question

A garden is in the shape of a semi circle of radius 42m a person jogs around the garden 3 times what is the distance covered by him

Answer 1

Distance covered is 3 times the circumference of the semi circle.
So, 3*πr = 3*3.14*42 = 395m.

Hope it helps.
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Answer 2

the distance covered in one round = perimeter of the semi circular garden + diameter
= π42 +2×42=3.14×42+84=215.88 m

so, in 3 round = 215.88×3=647.64 m
Thanks.