A picture is painted on a cardboard 8 cm long and 5 cm wide such that there is a margin - Maths - Perimeter and Area

Question

A picture is painted on a cardboard 8 cm long and 5 cm wide such
that there is a margin of 1 5 cm along each of its sides Find the
total area of the margin

Gopal Mohanty · Accepted Answer

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Length (l) of cardboard = 8 cm
Breadth (b) of cardboard = 5 cm
Area of cardboard including margin = l × b =
8 × 5 = 40 cm2
From the figure, it can be observed that the new length and
breadth of the cardboard, when margin is not included, are 5 cm and
2 cm respectively
Area of the cardboard not including the margin = 5 × 2 =
10 cm2
Area of the margin = Area of cardboard including the margin
− Area of cardboard not
including the margin
= 40 − 10 = 30 cm2

A picture is painted on a cardboard 8 cm long and 5 cm wide such that there is a margin of 1.5 cm along each of its sides. Find the total area of the margin.