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

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.