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What is the area between two concentric circles of diamet...

What is the area between two concentric circles of diameters 26cm and 20cm?

A.

100π

B.

169π

C.

69π

D.

9π

E.

269π

Correct answer is C

Area of circle 1 with diameter 26cm:

πr2=π×(262)2

= 169πcm2

Area of circle 2 with diameter 20 cm:

πR2=π×(202)2

= 100πcm2

Area between the two circles = (169100)πcm2

= 69πcm2