Question

If r=28cm then diameter=? And find circumference?​

Answer 1

Answer:

The diameter of the circle is 56cm and the circumference of the circle is 176cm.

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Step - By - Step Instructions:

Given:

Radius of the circle = 28cm

To Find:

The diameter of the circle and the circumference of the circle.

Solution:

Concept:

• Circumference - Is the distance around a circle or any curved geometrical shape. (refer to the attachment)

• The diameter is the distance across a circle through the centre, and it touches the two points of the circle perimeter. (refer to the attachment)

• Radius - A line segment extending from the center of a circle or sphere to the circumference or bounding surface. Hence, the radius is half of the diameter. It starts from a point on the circle, and ends at the center of the circle. (refer to the attachment)

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So,

Let the Radius be 'R' and Diameter be 'D'. Then,

D = (R × 2) units.

⠀= (28 × 2) cm.

⠀= 56cm.

Now, Formula used to find the circumference of the circle:

✰ Circumference = 2πR

where,

• R is the radius of the circle

• π is the mathematical constant with value of 22/7.

Now, substituting the given values:

:⟹ Circumference = (2 × 22/7 × 28)

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= (2 × 22 × 4)

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 176

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Answer 2

Given:

• Radius = 28cm.

To find:

• Diameter & radius ?

Solution:

• The shape is circle.

Where,

• Radius = 28cm.

• Let's consider radius be r.

⠀⠀━━━━━━━━━━━━━━━━━━━⠀

« Now, Finding diameter of the circle,

→ Diameter = r × 2

→ 28 × 2

→ 56cm

⠀⠀━━━━━━━━━━━━━━━━━━━⠀

« Now, Let's Find circumference of the circle,

→ Circumference = 2πr

→ 2 × 22/7 × 28

→ 2 × 22 × 4

→ 2 × 88

→ 176cm

∴ Hence, Diameter of the circle is 56cm & circumference of the circle is 176cm.