The Area Enclosed Between the Concentric Circles is 770cm2. If the Radius of Outer Circle 21cm. Find the Radius of Inner Circle - CBSE Class 10 - Mathematics
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The area enclosed between the concentric circles is 770cm2. If the radius of outer circle 21cm. find the radius of inner circle
Radius of outer circle = 21𝑐𝑚
Radius of inner circle = 𝑅2
Area between concentric circles = area of outer circle – area of inner circle
⇒ 770 =`22/7`(212 − R22)
⇒ 212 − 𝑅22 = 35 × 7 = 245
⇒ 441 – 245 = 𝑅22
⇒𝑅2= `sqrt(196)` = 14 𝑐𝑚
Radius of inner circle = 14cm.
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Solution The Area Enclosed Between the Concentric Circles is 770cm2. If the Radius of Outer Circle 21cm. Find the Radius of Inner Circle Concept: Areas of Combinations of Plane Figures.