The inside of an open metal box of internal dimensions 25 cm x 18 cm x 15 cm is lined with paper. Find the area of the paper required.
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EXPLANATION: length = 25cm
breathe =18cm
height =15cm
paper required =area of cuboid
area of cuboid =(LB+BH+HL)
=2(25×18+18+×15+15×25)
=2(450+270+375)
=2(1095)
=2190cm2
therefore, they are of a paper acquired is 2190cm2
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