Math Problem Statement

The net of a square pyramid is shown below. Use a ruler to measure the dimensions of the net to the nearest 1/4 inch. Which of the following is the best estimate of the lateral surface area of this square pyramid?

Solution

This image provides the net of a square pyramid, with dimensions and markings to estimate the lateral surface area.

To estimate the lateral surface area of the pyramid from the net, follow these steps:

  1. Identify the triangular faces: The net includes 4 congruent triangles that form the sides of the pyramid. Each triangle will contribute to the lateral surface area.
  2. Calculate the area of one triangle: The area of a triangle is given by the formula Area=12×base×height\text{Area} = \frac{1}{2} \times \text{base} \times \text{height}. The base of each triangle is the length of one side of the square base, and the height is the slant height of the pyramid.
  3. Estimate the dimensions: From the image, the dimensions of the base side are approximately 1¼ inches. The slant height (height of each triangle) appears to be roughly 1½ inches.
  4. Compute the area of one triangle: Using the base = 1¼ inches and the height = 1½ inches: Area of one triangle=12×1.25×1.5=0.9375square inches.\text{Area of one triangle} = \frac{1}{2} \times 1.25 \times 1.5 = 0.9375 \, \text{square inches}.
  5. Find the total lateral surface area: Since there are 4 triangular faces, the total lateral surface area is: Total lateral surface area=4×0.9375=3.75square inches.\text{Total lateral surface area} = 4 \times 0.9375 = 3.75 \, \text{square inches}.

The closest answer from the options is D: 4116in24 \frac{1}{16} \, \text{in}^2, which is a reasonable estimate for the lateral surface area.

Would you like further clarification on this process, or do you have more questions related to this topic?

Here are some related questions to explore further:

  1. How do you calculate the surface area of the entire square pyramid (including the base)?
  2. What changes in the lateral surface area calculation if the slant height is different?
  3. How can the area of the lateral surface of a pyramid be generalized for any polygonal base?
  4. How do you calculate the volume of a square pyramid?
  5. How would you approach the problem if the base was a different shape, such as a triangle?

Tip: Always double-check the measurements for accuracy, especially when working with approximations or estimating based on a net!

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Surface Area
Pyramids
Lateral Surface Area

Formulas

Area of a triangle = 1/2 × base × height
Lateral surface area of a pyramid = 4 × area of one triangular face

Theorems

Surface area of a pyramid
Calculation of lateral surface area of a square pyramid

Suitable Grade Level

Grades 7-9