Question

7. Find the perimeter and
8. The perimeter of a semi-circular metallic plate is 86-4 cm. Calculate the radius and area
the plate.
9. The circumference of a circle exceeds its diameter by 180 cm. Calculate (i) the rad
ference and (iii) the area of the circle.
1​

Answer 1

Answer:

Perimeter of a semi circular plate =πr+2r

Given, πr+2r=86.4

=>r(π+2)=86.4

=>r=

π+2

86.4

=>r=

7

22

+2

86.4

=>r=

7

36

86.4

=>r=

36

86.4×7

=>r=16.8 cm

Area of a semi circle =

2

πr

2

=

7×2

22×16.8

2

=443.52cm

2

Step-by-step explanation:

Please mark my answer as brain list.

Answer 2

Answer:

443.52 cm.............