We have 2 triangles:
Let H be the height of the second triangle and h the height of the first triangle. Hence, their area are given by
[tex]\begin{gathered} A=\frac{25\cdot h}{2} \\ B=\frac{25\cdot H}{2} \end{gathered}[/tex]
From these relations, we have
[tex]\frac{A}{B}=\frac{\frac{25\cdot h}{2}}{\frac{25\cdot H}{2}}[/tex]
By using the sandwich law, this is equal to
[tex]\frac{A}{B}=\frac{2(25\cdot h)}{2(25\cdot H)}[/tex]
Finally, the answer is
[tex]\frac{A}{B}=\frac{h}{H}[/tex]
