The formula for the area of a triangle is a=1/2bh , where b is the base of the triangle and h is the height of the triangle. what is the length of the base of a triangle with an area of 30 and a height of 12 ft? the formula for the volume of a sphere is 4/3 pie r 3 to the third power , where r is the radius. find the volume of a sphere with a radius of 2.6 cm. use . round to the nearest hundredth.