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Solutions
Given:
r + R = 11 cm
Sum of area = 73π cm2
Concept used:
Area of circle = π r2
Calculation:
Let, the radius of two circles be r and R.
⇒ r + R = 11 cm
⇒ r = 11 - R → (1)
⇒ π r2+ π R2= 73 π
⇒ r2+ R 2= 73
On putting the value of r from equation (1) in equation (2),
⇒ (11 - R)2+ R 2= 73
⇒ 121 + 2R2- 22R = 73
⇒ 2R2- 22R + 48 = 0
⇒ R2- 11R + 24 = 0
⇒ R2- 3R - 8R + 24 = 0
⇒ R(R - 3) - 8(R - 3) = 0
⇒ (R - 3)(R - 8) = 0
⇒ R = 3 or 8
The largest radius = 8 cm
∴ The radius of the larger circle is 8 cm