Riya pasted a picture that is 40 cm long and 28cm wide in the centre of a cardboard leaving a margin of 1 cm on all side. Find the area of the cardboard uncovered by the picture.
Answers
Answer:length of picture = 40cm
Breadth of picture =28cm
Area of picture =l*b
=28cm *40cm=1120cm2
Margin =1120–4
=1116cm2 ANS
Step-by-step explanation:
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Solution :-
Total length of the painting including the margin = 40 cm
Total width of the painting including the margin = 28 cm
Area of the painting including the margin = 40*28
Area of the painting including the margin = 1120 sq cm
Length of the painting without the margin = 40 - (2 + 2)
= 40 - 4
= 36 cm
Width of the painting without the margin = 28 - (2 + 2)
= 28 - 4
= 24 cm
Area of the painting without the margin = 36*24
Area of the painting without the margin = 864 sq cm
Area of the margin = Area of the painting including the margin - Area of the painting without the margin
⇒ 1120 - 864
= 256 sq cm
So, the total area of the margin is 256 square