Question

Plz tell correct answer in step by step answer with explanation plz......correct answer will get marked BRAINLIEST.......

Answer 1

Answer:

367.71 cm²

Step-by-step explanation

Let r and R be the radii of smaller and larger circle respectively.

Gɪᴠᴇɴ

Radius of outer circle, R = 21 cm

Difference in radius, R-r = 3 cm

Fᴏʀᴍᴜʟᴀ

Area of a circle with radius r is given by

Area = πr²

Cᴀʟᴄᴜʟᴀᴛɪᴏɴs

ʀᴀᴅɪᴜs ᴏғ sᴍᴀʟʟᴇʀ ᴄɪʀᴄʟᴇ

It is given that

R - r = 3

or 21 - r = 3

or r = 21 - 3

or r = 18 cm

ᴀʀᴇᴀ ᴏғ ʟᴀʀɢᴇʀ ᴄɪʀᴄʟᴇ

Aʀᴇᴀ = πR²

= π x 21² cm²

= 441π cm²

ᴀʀᴇᴀ ᴏғ sᴍᴀʟʟᴇʀ ᴄɪʀᴄʟᴇ

ᴀʀᴇᴀ = πr²

= π x 18² cm²

= 324π cm²

ᴀʀᴇᴀ ᴏғ sʜᴀᴅᴇᴅ ʀᴇɢɪᴏɴ

ᴀʀᴇᴀ = (ᴀʀᴇᴀ ᴏғ ʟᴀʀɢᴇʀ ᴄɪʀᴄʟᴇ)

- (ᴀʀᴇᴀ ᴏғ sᴍᴀʟʟᴇʀ ᴄɪʀᴄʟᴇ)

= 441π - 324π

= 117π

= 117 x 22/7

= 367.71 cm²

Answer 2

Step-by-step explanation:

And after this

the area of the shaded region = (the area of the outer circle - area of the inner circle )

where :

area of the outer circle = 1386 cm^2

area of the inner circle = 1016.4cm^2

as we said earlier we are subtracting both the areas now:

area of the shaded region = ( 1386 - 1016.4 )

= 369.6 cm^2

hope this answer help you

thank you! !