Homework Help: math

Posted by chester on Friday, October 12, 2007 at 8:34pm.

1. Find the area of a circle whose diameter is 5.1 centimeters (cm). Use 3.14 for ƒàƒnand round your answer to the nearest tenth of a square centimeter.

2.A triangle has base 13 feet (ft) and an altitude of 6 ft. Find its area

math - Ms. Sue, Friday, October 12, 2007 at 9:02pm
1. The area of a circle is found by multiplying pi times the radius squared.
A = pi * r^2

In a circle with a diameter of 5.1 cm, the radius is 2.55 cm.

A = 3.14 * 6.5025
A = ??

2. The area of a triangle is found by multiplying 1/2 the base times the height.

A = 1/2 * 13 * 6
A = ??

If you post your answers, we'll be glad to check them.
math - chester, Saturday, October 13, 2007 at 8:58am
I think the anwser would be 78

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