math
posted by chester .
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

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. 
I think the anwser would be 78