Question

Find the Length of an Arc of cricle which subtends an angle of 180 degree at the center if the radius of the cricle is 15 cm.

Answer 1

Here's diagram↑↑↑↑

The Length of an Arc of circle is HALF CIRCUMFERENCE OF CIRCLE.

½Circumference =2πr/2
=πr
=3.14285×15
=47.14275

Hope this help you.
:-)

Answer 2

Given : Radius of circle(r)=15 Cm

To Find : Length of the arc

Solution :

Circumference of circle = 2πr

= 2×π×15

Now length of arc of the same circle subtending on the angle of 180°

angle/360(2π×15)

180/360[2×3.14×15]

=47.1 cm rarely 47 cm