Question

if the diameter of protector is 21 CM then find its perimeter​

Answer 1

Hey, mate!

Answer:

Diameter=21cm

Radius=21÷2=10.5

Perimeter of a circle = 2πr

= 2×3.14×10.5

= 6.28×10.5

= 65.94cm

So, the perimeter of the protector

= 32.97cm; ans.

Hope it is helpful to you.

Please mark the answer as brainliest.

....................Thanks......................

Answer 2

Answer:

33 cm is the perimeter of the protector.

Step-by-step explanation:

Given:-

The diameter of a protector is 21 cm.

To find:-

The perimeter of the protector, i.e.,

The circumference of the protector.

According to the question,

It is given that the diameter of a protector is 21 cm.

So, the radius of a protector, r = 21/2 cm

As we know,

A protector is a semi circular object.

Since the circumference of semi-circle is $\pi r$.

So,

The circumference (or perimeter) of the protector is,

= $\pi r$

= $\frac{22}{7}\times \frac{21}{2}$

= 11 × 3

= 33 cm

Therefore, the perimeter of the protector is 33 cm.

#SPJ3