Answer:

1. A = ( 12 x 7 ) - ( 8 x 3 )

A = 60 sq.ft

2. A = ( 1/2 πR² ) - π r²

A = ( 1/2 x π x 4² ) - ( π x 2² )

A = 4π or 12.57 sq.cm

3. A = ( 12 x 8 ) - ( hindi makita?)

4. A = ( 12 x 16 ) - 1/2 ( 14 x 12 )

A = 108 sq.cm

5. A = πR² - πr²

A = (π x 14²) - (π x 7²)

A = 147π or 461.81 sq.cm