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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**

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 =