Ncert solutions

Ncert solutions

Grade 7

Perimeter and Area | Exercise 11.3

Question 11

Q12) The circumference of a circle is 31.4 cm. Find the radius and the area of the circle?

(Take \pi=3.14)

Solution 12:

Circumference of the circle= 31.4cm

2\pi r=31.4

r=\frac{31.4}{2\times3.14}=5cm

Area of the circle = 7\pi r^2=3.14\times5\times5=78.5cm^2

Hence, the required radius= 5cm and area= 78.5cm^2

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Question 11

Q12) The circumference of a circle is 31.4 cm. Find the radius and the area of the circle?

(Take \pi=3.14)

Solution 12:

Circumference of the circle= 31.4cm

2\pi r=31.4

r=\frac{31.4}{2\times3.14}=5cm

Area of the circle = 7\pi r^2=3.14\times5\times5=78.5cm^2

Hence, the required radius= 5cm and area= 78.5cm^2

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your mathematics exam ?

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Book a free class now
subject-cta
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