Question

Tia is making a case for her calculator. It is a rectangular prism that will be 3.5 inches long by I inch wide by 1 inch wide by 10 inches high. How much material will she need to make the case

Answer 1

Here the length of the prism is 10 in. = l

The width of the prism is 3.5 in = b

And the height of the prism is 1 in. = h

Now this prism is basically a cuboid.

The surface area of a cuboid is

= 2 ( lb + bh + lh)

Substituting the values we get

= 2 (10 ×3.5 + 3.5 × 1 + 10 ×1)

= 2 ( 35 + 3.5 + 10)

= 2 ( 48.5)

= 97 in².

Hence the total surface are of the prism is 97 in².

Tia shall need 97 in² of material to make the case for her calculator.

Answer 2

S.A= (2)(3.5)(10)+(2)(3.5)(1)+(2)(10)(1)
S.A=97in squared