In the adjoining figure, area enclosed between the concentric circles is 770 cm2

In the adjoining figure, the area enclosed between the concentric circles is 770 cm2. If the radius of the outer circle is 21 cm, calculate the radius of the inner circle.
ML Aggarwal Class 8 Solutions for ICSE Maths Chapter 18 Mensuration Ex 18.1 10

Solution:
ML Aggarwal Class 8 Solutions for ICSE Maths Chapter 18 Mensuration Ex 18.1 11

A copper wire when bent in the form of a square encloses an area of 121 cm2. If the same wire is bent into the form of a circle, find the area of the circle.

Solution:
ML Aggarwal Class 8 Solutions for ICSE Maths Chapter 18 Mensuration Ex 18.1 12

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