What is the area between two concentric circles of diamet...
What is the area between two concentric circles of diameters 26cm and 20cm?
100\(\pi\)
169\(\pi\)
69\(\pi\)
9\(\pi\)
269\(\pi\)
Correct answer is C
Area of circle 1 with diameter 26cm:
\(\pi r^{2} = \pi \times (\frac{26}{2})^{2} \)
= \(169 \pi cm^{2}\)
Area of circle 2 with diameter 20 cm:
\(\pi R^{2} = \pi \times (\frac{20}{2})^{2}\)
= \(100 \pi cm^{2}\)
Area between the two circles = \((169 - 100) \pi cm^{2}\)
= \(69 \pi cm^{2}\)
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