Task 1. The area of ​​the envelope of a regular four-sided prism is M = 120cm2 and the length of its height is H = 5cm. Calculate:
a) the length of the base edge a,
b) the surface of the prism,
c) the volume of the prism.

Task 2. In a square pool measuring 20m, 15m and 2m, there is water up to - height (depth).
How many waters are there in that pool, and how many liters?

Task 3. Calculate the area of ​​a regular hexagonal prism if the length of the diagonal of the base
d = 12 cm, and the length of the diagonal of the prism is 15 cm.​