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2016-04-12T22:43:41+05:30

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10.) We need to get the total area of the box.
4 rectangles : length = 4cm ; width = 3 cm
2 squares : side lengths = 3cm

Area of rectangle = 4cm * 3cm = 12 cm² * 4 = 48 cm²
Area of square = (3cm)² = 9cm² * 2 = 18cm²

48cm² + 18cm² = 66cm²

Area of paper = 15cm * 20cm = 300 cm²

wasted area = 300 cm² - 66cm² = 234 cm²

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