Question 1086265
Find the height using the Pythagorean theorem,
{{{L^2+H^2=D^2}}}
{{{45^2+H^2=75^2}}}
{{{H^2=5625-2025}}}
Solve for H then plug the value into the area formula,
{{{A=LH}}}
{{{A=45H}}}{{{cm^2}}}