Given:
5cm ; 7cm ; 2cm
Since the measurement were not identified, I'll just state the formula for finding the volume of a triangular prism.
Volume of triangular prism = 1/2 * base * height * length
V = 1/2 * 5cm * 7cm * 2cm
V = 1/2 * 70cm³
V = 35 cm³
Volume of a triangular prism is 35cm³