The area of the shaded triangle is equal to:
[tex]A=\frac{1}{2}bh[/tex]
the base of the shaded triangle is 4 in and the height is 5 in, then:
[tex]\begin{gathered} A=\frac{1}{2}(4)(5) \\ =\frac{1}{2}\cdot20 \\ =10 \end{gathered}[/tex]
Therefore the shaded area is 10 squared inches.
