Question

Regina’s work to find the surface area of a square pyramid from its net is shown below.
Surface area of the pyramid = 4 (one-half (9.4) (12.8)) + 9.4 squared = 329 square inches

What error did Regina make?
-She should have used One-half (9.4) (11.9) to represent the area of a single triangle.
-She should have multiplied all the terms inside the parentheses by 4 when she simplified.
-She should have used One-half (4.7) (12.8) to represent the area of a single triangle.
-She should have used a different collection of shapes as the net of the pyramid.

Answer 1

The option first  "She should have used One-half (9.4) (11.9) to represent the area of a single triangle" is correct.

What is a square pyramid?

In geometry, it is defined as the shape having a square base with equal sides length and all the vertex of the square's joints at the top, which is perpendicular to the centre of the square.

We have:

The height of the pyramid = 11.9 in

The base length of the pyramid = 9.4 in

Surface area of the pyramid:

$\rm = 4(\dfrac{1}{2}\times 9.4\times11.9) + 9.4^2$

Regina's made a mistake she uses slant height, she should use height of the pyramid which is 11.9 in.

Thus, the option first  "She should have used One-half (9.4) (11.9) to represent the area of a single triangle" is correct.

Learn more about the pyramid here:

brainly.com/question/13057463

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Answer 2

Answer:

The answer is A

Step-by-step explanation: