Question

The area of a circular disc is 38.5cm2?
Find circumference​

Answer 1

Answer:

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Step-by-step explanation:

area = pi r²

38.5 =22/7r²

r²= 12.25

r = √12.25 which is 3.5.

The radius is 3.5 cm.

Answer 2

Answer:

The area of a circular disc is 38.5cm2?

Find circumference​

• Let the radius of circular disc be R  
• Area of Circular Disc = 38.5 cm²  
• We know that Area of Circle = π(Radius)²  
• ∴ π × R² = 38.5  
• 22/7 × R² = 38.5  
• R² = (38.5 × 7)/22  
• R² = 3.5 × 3.5  
• R² = 3.5²  
• R = 3.5 cm  
• Now, Circumference of Circle = 2π×Radius  

∴ Circumference of given Circular Disc = 2 × (22/7) × 3.5  

                                                                = 22 cm

Step-by-step explanation:

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