Question

Total surface area of the drawing

Answer 1

The pentagon's area is the sum of the 5 triangles that comprise it. This is


`5( (1)/(2)bh) * 2=5(9)(6.2)= 279`

where the factor of 2 accounts for the top and bottom. The walls have an area of 5 rectangles


`5(bh)=5(9)(6)=270 \\ \\ 279+270=549km^2`