Given:
Height, h = 4 cm
Base, = 6 cm
Length, L = 20 cm
To find the permieter of the base which is the is isosceles triangle, let's find the two equal sides using pythagorean theorem.
We have:
thus, perimeter of the base is:
P = 5 + 5 + 6 = 16 cm
Thus, we have:
TSA =