Question

Find the area of a circular ring whose inner and outer radii are 16 cm and 19 cm

Answer 1

To find area of a circular ring whose inner radii and Outer radii are 16 cm and 19 cm respectively.
we need to use the following formula,
area of circular ring=π(R^2-r^2)
=22/7(19^2-16^2)
=22/7(361-256)
=22/7×105
=22×15
=330cm^2
hope it helps...

Answer 2

Answer:

329.7 square m.

Step-by-step explanation:

Outer radius = 19 cm

Area of outer circle = $\pi r^2$

                                = $3.14 \times(19)^2$  

                                = $1133.54$  

Inner radius = 16 cm

Area of Inner circle = $\pi r^2$

                                = $3.14 \times(16)^2$  

                                = $803.84$  

Thus the area of circular ring = Area of outer circle - Area of inner circle

                                                =1133.54-803.84

                                                =329.7

Hence the area of circular ring is 329.7 square m.