Question

the radius of circle is 28cm.Find the circumference .(Take 22 upon 7​

Answer 1

Given :

• Radius of circle = 28 cm

To find :

• Circumference of circle

Concept Used :-

→ Formula to calculate circumference of circle :-

• Circumference of circle = 2πr

where,

• Take π = 22/7
• r = radius of the circle

Solution :

Circumference of the circle :-

⠀⠀⠀⇒ Circumference = 2πr

⠀⠀⠀⇒ Circumference = 2 × 22/7 × 28

⠀⠀⠀⇒ Circumference = 2 × 22 × 4

⠀⠀⠀⇒ Circumference = 176

Circumference of the circle = 176 cm

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Know MorE ~

• Area of circle = πr²
• Diameter = 2 × Radius
• Radius = Diameter/2
• Surface area of sphere = 4πr²
• Volume of cylinder = πr²h
• Volume of cone = 1/3 πr²h
• Curved surface area of cone = πrl
• Total surface area of cone = πrl + πr²h
• Total surface area of cylinder = 2πrh + 2πr²

Answer 2

Given :

• Shape = Circle
• Radius of Circle = 28cm
• Value of π = 22/7

To Find :

• Circumference of Circle

Solution :

✰ As we know that, Circumference of Circle is given by 2πr . Now in this question Radius is given so we will simply fill the value of radius in the formula to find the Circumference.

⠀

Putting the Values :

⟹ Circumference of Circle = 2πr

⟹ Circumference of Circle = 2 × 22/7 × 28

⟹ Circumference of Circle = 44/7 × 28

⟹ Circumference of Circle = 44 × 28/7

⟹ Circumference of Circle = 1232/7

⟹ Circumference of Circle = 176cm

Thus Circumference of Circle is 176cm

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★ Additional Info :

Formulas Related to Circle:

• Circumference of Circle = 2πr
• Area of Circle = πr²
• Diameter of Circle = 2r
• Radius of Circle = Diameter/2

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