Question

Find the circumference of a circle whose radius is 8.5cm​

Answer 1

Answer:

$\red\bigstar$ Hope this is correct and helps UH....

Answer 2

Answer

$\purple{\bigstar}$ Circumference of a circle $\leadsto$ ${\boxed{\sf{\red{53.43~cm}}}}$

• Given

• Radius of a circle = 8.5 cm

• To find

• Circumference of a circle

• Solution

We are given the value of the radius of the circle, and we have to find circumference. By substituting the value of radius in the formula - 2πr we will find circumference of the circle.

• Take π = 22/7

$\purple{\bigstar}$ $\boxed{\underline{\sf{Circumference~of~circle = 2\pi r}}}$

Substitute the given values,

⟶ 2 × 22/7 × 8.5

⟶ 374/7

⟶ 53.43 cm

• Circumference of circle = 53.43 cm

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Some related formulae -

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

where,

• r = radius of the circle
• h = height
• l = length

and Take π = 22/7