Question

if the perimeter of a semi circular is 108 ,m then find he area of the park​

Answer 1

Step-by-step explanation:

Let the radius of the protractor be r cm. Then,

Perimeter =108cm.

⇒21(2πr) + 2r = 108 ..........[∴Perimeterofasemicircle=21(2πr)]

⇒πr+2r=108⇒722×r+2r=108⇒36r=108×7⇒r=3×7=21

∴ Diameter of the protractor =2r= (2×21)cm=42cm

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Answer 2

Answer:

Let the radius of the protractor be r cm. Then,

Perimeter =108cm.

⇒21(2πr) + 2r = 108 

[∴Perimeter = 2πr]

⇒πr+2r=108

⇒722×r+2r=108

⇒36r=108×7

⇒r=3×7

=21

∴ Diameter of the protractor =2r

= (2×21)cm

=42cm