Question

if diameter of semicircle is 12cm .find its perimeter​

Answer 1

$\bold{\underline{\underline{Answer:}}}$

Perimeter of the semi circle is 30.84 cm.

$\bold{\underline{\underline{Step\:-\:by\:-\:step\:explanation:}}}$

Given :

• Diameter of the semi circle is 12 cm

To find :

• Perimeter of the semi circle

Solution :

Radius = $\bold{\frac{Diameter}{2}}$

Radius = $\bold{\frac{12}{2}}$

•°• Radius = 6 cm

We know that the perimeter of the semi circle is calculated using the formula :-

$\bold{\boxed{Perimeter\:of\:a\:semi\:circle\:=\pi\:r\:+\:2r}}$

Where, π = 3.14 and r = 6 cm

Block in the values,

$\bold{Perimeter\:of\:\:semi\:circle\:=\:3.14\times\:6\:+\:2\times6}$

$\bold{Perimeter\:of\:\:semi\:circle\:=18.84\:+12}$

$\bold{Perimeter\:of\:\:semi\:circle\:=30.84}$

•°• Perimeter of the semi circle is 30.84 cm.

Answer 2

ANSWER:-

Given:

•If a diameter of semicircle is 12cm.

To find:

Finds its perimeter.

Solution:

Semicircle: A semicircle is a one-dimensional locus of points that forms of a circle.

According to the question:

•Diameter of semicircle= 12cm

•Radius of semicircle= d/2 = 12/2

=) 6cm

Now,

Formula of perimeter of semicircle:

=) πr + 2r

$= > \frac{22}{7} \times 6 + 2 \times 6 \\ \\ = > \frac{132}{7} + 12 \\ \\ = > \frac{132 + 84}{7} \\ \\ = > \frac{216}{7} cm \\ \\ = > 30.85cm$

Thus,

The perimeter of semicircle is 30.85cm.

Thank you.