It already cuts the figure into a rectangle and a triangle, just find the measurements and use the formulas.
Rectangle:
Length: 10
Width: 6
[tex]\sf A=l\times w[/tex]
[tex]\sf A=10\times 6[/tex]
[tex]\sf A=60[/tex]
Triangle:
Base: 10
Height: 5
[tex]\sf A=\dfrac{1}{2}bh[/tex]
[tex]\sf A=\dfrac{1}{2}(10)(5)[/tex]
[tex]\sf A=25[/tex]
Add the two areas to get the area of the entire figure.
[tex]\sf 60+25=\boxed{\sf 85}[/tex]