ANSWER:
1. b = 5
2. h = 6
3. b = 30
STEP-BY-STEP EXPLANATION:
We know the ratio between height and base.
By means of the following proportions we can determine the missing dimensions in each case:
[tex]\begin{gathered} \frac{5}{2}=\frac{b}{h} \\ \\ \text{ 1st triangle} \\ \\ \frac{5}{2}=\frac{b}{2}\rightarrow b=5 \\ \\ \text{ 2nd triangle} \\ \\ \frac{5}{2}=\frac{15}{h}\rightarrow h=\frac{15}{5}\cdot2\rightarrow h=6 \\ \\ \text{ 3rd triangle} \\ \\ \frac{5}{2}=\frac{b}{12}\rightarrow b=12\cdot\frac{5}{2}\rightarrow b=30 \end{gathered}[/tex]
