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bekas [8.4K]
3 years ago
9

Does anyone know the answer for this?

Mathematics
1 answer:
Kazeer [188]3 years ago
5 0

Answer:

8 cm

Step-by-step explanation:

The area of the shaded portion is:

a = \pi \times (( {r1)}^{2}  -  {(r2}^{2}))

A=39π cm^2

r1 is the radius of the large circle

r2=5 cm

So,

39\pi = \pi \times (( {r1)}^{2}  -  {5}^{2} ) \\ r1 = 8 \: cm

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