Question

9. Find the perimeter of a semicircular plate of radius 3.85 cm.


Anser fast
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Answer 1

Given−

theradiusofasemicircle=25cm.

Tofindout−

theperimeter=Candarea=Aofthesemicircle=?

Solution

Weknowthat

theperimeterofasemicircle=C

=thesemicirculararc+thediameter=πr+2r

⟹C=r(π+2)=25(3.14+2)=128.5cm.

Againar.semicircle=A=

2

1

πr

2

whenr=radiusofthecircle

⟹A=

2

1

×

7

22

×25

2

cm

2

=981.25cm

2

.