Question

PLEAS HELP I HAVE HAD 3 tutors and not one could help

Answer 1

Lets do this by parts:

We have 3 rectangles of sides 18ft and 7ft; and 2 triangles of base 7ft and height 6.1ft

The area of a rectangle is side times side. Then, for each rectangle:

`7ft\cdot18ft=126ft^2`

Then, we have 3 rectangles of area 126ft^2, the total of the three rectangles:

`3\cdot126ft=378ft^2`

Now for the triangles, we know that the area of a triangle is base times height divided 2. THen:

`(7ft\cdot6.1ft)/(2)=21.35ft^2`

We have 2 triangles, thus:

`2\cdot21.35ft^2=42.7ft^2`

The total area is the sum of the areas of the rectangels and the triangles:

`378ft^2+42.7ft^2=420.7ft^2`

The total surface area of the prism is 420.7ft²