What is the area between two concentric circles of diamet...
What is the area between two concentric circles of diameters 26cm and 20cm?
100π
169π
69π
9π
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 = (169−100)πcm2
= 69πcm2
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