## Geometry: Common Core (15th Edition)

Use the formula for the area of a triangle: A=$\frac{1}{2}$bh 108=$\frac{1}{2}$(3x)(2x) 216=6$x^{2}$ 36=$x^{2}$ 6=x Substitute 6 into the equations for length and height: l=3(6)=18 h=2(6)=12