The area enclosed between the concentric circles is 770 cm2 . If the radius of the outer circle is 21 cm, find the radius of the inner circle.

The area enclosed between the concentric circles is 770 $c m^{2}$ . If the radius of the outer circle is 21 cm, find the radius of the inner circle.

Matching exercise

Match the items on the right to the items on the left.

Step 1

Step 2

Step 3

Step 4

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