We can put the 5-sided face downwards so that we have a pentagon-prism.
The volume of the figure will be area of base (area of pentagon) x height.
This way, the height of the figure will be 8 cm and we will find the area of the pentagon, below.
Let's find the area of the base first:
The pentagonal base can be broken down into a square (top left), a triangle (top right), and a rectangle (bottom). We find each of the areas.
• Area of Square
Side lengths are 3 cm, so the area will be:
Area = 3 x 3 = 9
• Area of Triangle
Base is 3 cm and height is 4 cm, so the area will be:
Area = (1/2) * base * height
Area = (1/2) * 3 * 4 = 6
• Area of Rectangle
Base is 7 cm and height is 2 cm, so the area will be:
Area = 7 x 2 = 14
Total Area of Pentagon = 9 + 6 + 14 = 29
Now, the Volume of the Composite Figure is:
Volume = Area of Pentagonal Base * Height
Volume = 29 * 8
Volume = 232 cubic centimeters
AnswerVolume = 232 cubic centimeters
