Question

A cardboard measure 30 centimetre long and 20 cm wide A strip of 4 cm wide is cut from it all around find the area of remaining sheet and also the area of the strip cut out.​

Answer 1

SO AREA OF ORIGINAL CARDBOARD = 30 × 20

NOW AREA OF CUTTED CARDBOARD= 30 × 4 + 20 × 4

AREA OF ORI. CARDBOARD - THE STRIP OF CARDBOARD

= 600 - 200

= 400 cm square