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zvonat [6]
3 years ago
11

Anyone? help? please?

Mathematics
1 answer:
valina [46]3 years ago
3 0

Answer:

Area of the remaining board = 403 cm²

Step-by-step explanation:

Area of the remaining paper board = Area of the rectangle - Area of the semicircle

Area of the rectangle = Length × Width

                                    = 28 × 20

                                    = 560 cm²

Area of the semicircle = \frac{1}{2}\pi r^{2}

                                     = \frac{1}{2}(3.14)(\frac{20}{2})^2

                                     = 3.14 × 50

                                     = 157 cm²

Area of the remaining board = 560 - 157

                                                = 403 cm²

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