Question

Quincy folds a piece of cardboard to make the three sides of a triangular prism open at top

and bottom. The triangular prism and the piece of cardboard that he used are shown below.
What is the area of the piece of cardboard?
20 cm
9 crn
540 square
centimeters
460 square
centimeters
563 square
centimeters
500 square
centimeters
62% complate

Answer 1

500 cm²

Explanation:

You haven't presented any diagrams, so I assume the prism has the dimensions shown below.

Then the dimensions of the original piece of cardboard are as in the second figure.

The area of the cardboard is the same as the lateral area of the triangular prism.

The formula for the area of a rectangle is

A = lw

l = 9 cm + 9 cm + 7 cm = 25 cm

w = 20 cm

A = 25 cm × 20 cm = 500 cm²

The area of the piece of cardboard is 500 cm².