Question

Look at the figure.



If the area of triangle ABC is 240 cm², the area of triangle BDE is _____ cm².

Answer 1

Both triangles are similar.

The proportion of the hypotenuse of the triangles is given by 10/5 = 2

Thus the proportion of their area would be 2^2 = 4

Area of triangle BDE is 240/4 = 60cm^2

Answer 2

Thanks! I understand it now.