Question

3) ਜੇਕਰ ਅਰਧ ਚੱਕਰ ਦਾ ਪਰਿਮਾਪ 36 ਸਮ ਹੋਵੇ, ਤਾਂ ਉਸਦਾ
ਆਸ ਪਤਾ ਕਰੋ। If the perimeter of a semicircle is 36
m, find its diameter.
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Answer 1

Answer:

perimeter (circumference) of circle=36×2 = 72units

Diameter= 11.45units

Answer 2

Answer:

Perimeter of semicircle= 36cm

Perimeter of semicircle= πr+2r

Now

πr+2r= 36

(22/7)×r +2r =36

$\frac{22}{7} r + 2r = 36 \\ 22r + 14r = 252 \\ 36r = 252 \\ r = \frac{252}{36} \\ r = 7cm$

we know

D=2r

D = 2×7= 14 cm

r = radius

D = diameter