Question

If Circumference of a circle is 198 cm. Find its radius and diameter?

Answer 1

Step-by-step explanation:

Perimeter of circle=2πr=198cm

πr=99

r=99×7/22

r=63/2

r=31.5cm

Therefore, Diameter=2r=63cm

Answer 2

Answer:

∴ Radius of a circle is $31.52$ cm and diameter of a circle is $63.04$ cm.  

Step-by-step explanation:

• In context with question asked,
• We have to find the radius and diameter of a circle.
• It is given that, Circumference of a circle = $198$ cm
• Circle is a set of points arranged at an equal distance from the center of a  circle.
• Circumference is the outer boundary of a circle.
• The formula for circumference of a circle is given by,

      Circumference of a circle = $2\pi r$

                                   ∴ $198 = 2\times 3.14\times r$

                                   ∴ $198=6.28\times r$

                                      ∴ $r=\frac{198}{6.28}$

                                      ∴ $r=31.52$ cm

• Now, we know that, diameter is twice the radius.

       ∴ Diameter of a circle = $2\times r$

                                       = $2\times 31.52$

                                       = $63.04$ cm

• ∴ Radius of a circle is $31.52$ cm and diameter of a circle is $63.04$ cm.