Question

area of circular Ring with outer and inner radii R1 and R2 respectively is​

Answer 1

Answer:

Area of circular ring is $\pi\:({R_1}-{R_2})({R_1}+{R_2})\:square\:units$

Step-by-step explanation:

Formula used:

Area of a circle of radius 'r' is $\pi\:r^2$ square units

Now,

Area of circular ring

=(Area of outer circle)-(Area of inner circle)

$=\pi\:{R_1}^2-\pi\:{R_2}^2\\\\=\pi\:({R_1}^2-{R_2}^2)\\\\=\pi\:({R_1}-{R_2})({R_1}+{R_2})\:square\:units$

Answer 2

Area of ring = $\frac{22}{7} ((R1)^2-(R2)^2)$

Step-by-step explanation:

Area of circle =$\pi r^2$

Where r is the radius

Inner radius of the ring = R2

Inner area = $\pi (R2)^2$

Outer radius of the ring = R1

Outer area = $\pi (R1)^2$

Area of ring = Outer area - inner area

Area of ring = $\frac{22}{7} ((R1)^2-(R2)^2)$

Hence Area of ring = $\frac{22}{7} ((R1)^2-(R2)^2)$

#Learn more :

A circular garden is surrounded by a path 4m wide.The diameter of the circular garden is 64m.What is the area of the circular path

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