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A rectangle is 8 cm long and 4.56 cm wide. What is the area of a circle equal to the circumference of the rectangle?
2 × (8 + 4.56) = 25.12 (CM), 25.12 ／ 3.14 ／ 2 = 4 (CM), 3.14 × 42 = 3.14 × 16 = 50.24 (square cm). A: the area of a circle equal to the circumference of this rectangle is 50.24 square cm
Draw the largest semicircle in a rectangle 10 cm long and 8 cm wide. Its circumference is______ Cm, the area is______ Square centimeter
3.14 × 10 ／ 2 + 10 = 15.7 + 10 = 25.7 (CM) 3.14 × (10 ／ 2) 2 ／ 2 = 3.14 × 25 ／ 2 = 39.25 (square cm); answer: the circumference of this semicircle is 25.7 cm and the area is 39.25 square cm. So the answer is: 25.7; 39.25
Draw the largest semicircle in a rectangle 10 cm long and 8 cm wide. Its circumference is______ Cm, the area is______ Square centimeter
3.14 × 10 ／ 2 + 10 = 15.7 + 10 = 25.7 (CM) 3.14 × (10 ／ 2) 2 ／ 2 = 3.14 × 25 ／ 2 = 39.25 (square cm); answer: the circumference of this semicircle is 25.7 cm and the area is 39.25 square cm. So the answer is: 25.7; 39.25
Draw the largest semicircle in a rectangle 10 cm long and 8 cm wide. Its circumference is______ Cm, the area is______ Square centimeter
3.14 × 10 ／ 2 + 10 = 15.7 + 10 = 25.7 (CM) 3.14 × (10 ／ 2) 2 ／ 2 = 3.14 × 25 ／ 2 = 39.25 (square cm); answer: the circumference of this semicircle is 25.7 cm and the area is 39.25 square cm. So the answer is: 25.7; 39.25
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