Question

Calculate the perimeter of this semi-circle with diameter 12cm. Leave your answer in terms of π

Answer 1

Answer:

$6\pi + 12$

Step-by-step explanation:

perimeter of semi circle is pi *radius +diameter

=>. perimeter is:

$6\pi + 12$

Answer 2

Answer:

FORMULA - 1/2 ( π × d ) + d

=> 1/2 ( π × 12 ) + 12

=> ( 1/2π × 6 ) + 12

=> {( 1/2π + 12 ) × ( 6 + 12 )}

=> {( 1/2π + 12 ) × ( 18 )}

Step-by-step explanation:

If diameter of semicircle is 12cm . find its perimeter

1. Perimeter of the semi circle is 30. 84 cm.
2. •°• Radius = 6 cm.
3. We know that the perimeter of the semi circle is calculated using the formula :-
4. Where, π = 3.14 and r = 6 cm.
5. •°• Perimeter of the semi circle is 30. 84 cm.

Circumference : C = 2πr ( for a full circle )

A semicircle is a circle cut in half, so we get half of the old circumference + cut length. The cut length is 2r.

So Semi circle circumference :

= (2πr)/2 + 2r

= πr + 2r = r(π + 2)

r = 12 → 12(π + 2)