Find the area of a circle with radius 5mm, rounded to the nearest tenth. A. 15.7mm2 B. 31.4mm2 C. 78.5mm2 D. 246.7mm2

Find the circumference of a circle with radius 20ft., rounded to the nearest tenth. A. 31.4ft. B. 62.8ft. C. 125.7ft. D. 1256.6ft.

What is the area of a circle with diameter 20cm? Round your answer to the nearest tenth. A. 125.7cm2 B. 314.2cm2 C. 400cm2 D. 1256.6cm2

Question

dambriemiller13 dambriemiller13

19-01-2019
Mathematics

contestada

Find the area of a circle with radius 5mm, rounded to the nearest tenth. A. 15.7mm2 B. 31.4mm2 C. 78.5mm2 D. 246.7mm2

Find the circumference of a circle with radius 20ft., rounded to the nearest tenth. A. 31.4ft. B. 62.8ft. C. 125.7ft. D. 1256.6ft.

What is the area of a circle with diameter 20cm? Round your answer to the nearest tenth. A. 125.7cm2 B. 314.2cm2 C. 400cm2 D. 1256.6cm2

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bambino51 bambino51 · Answer 1 · 2019-01-19T03:23:35+01:00

1. The Formula to getting the area of a circle is pi r^2= 3.14 times the radius squared. Plug in the number given in the question to get your answer.
2. The Circumference formula is 2pir which is 2 time 3.14 times the radius given. Plug in the number to get your answer.
3. This one is giving you the diameter, therefore you need to divide the diameter by 2 to get the radius (diameter is twice the size of radius) and plug in the radius into the first formula (3.14 times r^2) to get your answer.