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Need to find the radius of sector b.​

Need to find the radius of sector b.​-example-1

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4 votes

Answer:

7.7cm to 1 decimal place

Explanation:

for 1st circle, area of full circle = π r² = π (12)² = 144π

area of sector for 1st circle = (42/360) X 144π = 16.8π

for sector of 2nd circle, area = 16.8π

area of sector = (103/360) π r² = 16.8π

π r² = (16.8π) ÷ (103/360)

= 184.469.....

r² = 58.718.....

r = 7.7 cm to 1 decimal place

User DerM
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