The area of a triangle whose height is equal to the length of the base is 40•5cm.Caculate the length of the base using the elementary mathematical table ?

To calculate the length of the base of the triangle, we can use the formula for the area of a triangle:

Area = 1/2 * base * height

Given that the height is equal to the length of the base, we can substitute the height for the base in the formula:

40.5 = 1/2 * base * base
40.5 = 1/2 * base^2
81 = base^2
base = √81
base = 9

Therefore, the length of the base of the triangle is 9 cm.