From a rectangular sheet of tin, of size 100 cm by 80 cm, are cut four squares of side 10 cm from each corner. Find the area of the remaining sheet.

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Solution

Given that length of rectangular sheet = 100 cm
Breadth of rectangular sheet = 80 cm
Area of the rectangular sheet of tin = 100 cm $\times$ 80 cm
= 8000 cm²
Side of the square at the corner of the sheet = 10 cm
Area of one square at the corner of the sheet = (10 cm)²=
100 cm²
Area of 4 squares at the corner of the sheet = 4 $\times$ 100 cm² = 400 cm²
Hence,
Area of the remaining sheet of tin = Area of the rectangular sheet - Area of the 4 squares
Area of the remaining sheet of tin = (8000 – 400) cm²=
7600 cm²

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