Question

A perimeter of a semicircle is 144 what is its daimeter

Answer 1

perimeter of a semicircle is given by 2 pie R +2r
=pie d+d
144=d (pie +1)
144=d (22/7+1)
144=d (29/7)
144×7/29=d
d=34.76 units.

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Answer 2

Perimeter =2×22/7×r
144=44/7×r
144×7/44=r
22.9=r

So diameter = 22.9×2=45.8
(You have not told the unit)
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