8 cm
3 cm
4 cm
7 cm
4 cm
9 cm
3 cm

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

The surface area of the triangular prism is .