Question

Two concentric circles have radii of 21 cm and 14 cm respectively. The area between the two circles

1. 462 sq cm

2. 762 sq cm

3. 770 sq cm

4. 780 sq cm


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Answer 1

Answer:

770

Step-by-step explanation:

$r1 = 21cm \\ r2 = 14cm$

$\pi {r1}^{2} - \pi {r2}^{2}$

$1386 - 616$

$= 770 {cm}^{2}$