A picture is painted on cardboard 8 cm long and 5 cm wide such that there is margin of 1.5 cm along each of its sides. Find the total area of the margin.
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Answer:
30 cm²
Step-by-step explanation:
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
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