Question

FIND THE PERIMETER AND AREA OF A SEMI-CIRCLE OF RADIUS 10.5 cm​

Answer 1

Answer:

The perimeter of semi -circular disc of radius =54 cm

Step-by-step explanation:

Radius of circle = 10.5 cm

Perimeter of semicircle =\pi r +2rπr+2r

=\frac{22}{7} \times 10.5 + 2(10.5)

7

22

×10.5+2(10.5)

= 54 cm

Hence the perimeter of the semi-circular disc of radius 10.5 cm is 54 cm

Answer 2

Answer:

Perimeter=33cm

Area=173.25cm sq.

Explanation:

As a semicircle is half of a circle so,

Perimeter of a semicircle=2πr/2

=πr

=22/7*10.5

=22*1.5

=33.0cm

Area of a semicircle =πr^2/2

=22*10.5*10.5/7*2

=173.25cm^2