Question

Find the area of a circular ring made by two concentric circles of radii 7cm and 10.5 cm .

Answer 1

Answer:

• π(h+2r)h

Step-by-step explanation:

A= area of bigger circle - area of smaller circle

=π(r+h) 2 −πr 2

=π(r 2 +h 2 +2hr−r 2 )

=π(h 2 +2hr)

=π(h+2r)h

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Answer 2

Answer:

Area of ring=192.325

Step-by-step explanation:

Radius of large circle=10.5cm

Radius of small circle=7cm

Area of circular ring= area ( big circle - small circle)= π*(10.5**2)-π(7**2)= π(110.25-49)=π(61.25)

π=3.14

Area of ring=192.325