page 21 of 21

Area of Composite Figures Quick Check
5 of 55 of 5 Items

Question
Use the image to answer the question.

An illustration shows a shape that appears as a square with a semicircle attached on the left side and the top. The side of the square is 2 inches and the diameter of the semicircles is 2 inches. The overlapping lines, which include the top and left side of the square, are marked as dashed lines. Right angle symbols are shown on the top left and bottom right corners of the square.

You are making a card for a friend that looks like a heart shape. Solve for the total area of the shape. Use 3.14 as pi. Round the answer to the nearest hundredth.

(1 point)
Responses

10.28 in.2
10.28 in. squared

5.57 in.2
5.57 in. squared

7.14 in.2
7.14 in. squared

16.56 in.2

1 answer

To calculate the total area of the composite figure consisting of a square and two semicircles (attached to the left and top), we can break it down step-by-step.

  1. Area of the Square: The area \( A \) of a square is given by the formula: \[ A = \text{side}^2 \] With the side length of the square being 2 inches: \[ A_{square} = 2^2 = 4 \text{ in}^2 \]

  2. Area of One Semicircle: The area \( A \) of a circle is given by the formula: \[ A = \pi r^2 \] The diameter of each semicircle is 2 inches, so the radius \( r \) is: \[ r = \frac{2}{2} = 1 \text{ inch} \] Therefore, the area of one semicircle is: \[ A_{semicircle} = \frac{1}{2} \pi r^2 = \frac{1}{2} \pi (1)^2 = \frac{1}{2} \pi = \frac{3.14}{2} = 1.57 \text{ in}^2 \]

  3. Area of Both Semicircles: Since there are two semicircles, we multiply the area of one semicircle by 2: \[ A_{2 , semicircles} = 2 \times 1.57 = 3.14 \text{ in}^2 \]

  4. Total Area of the Shape: Now, we can combine the areas of the square and the two semicircles: \[ A_{total} = A_{square} + A_{2 , semicircles} = 4 + 3.14 = 7.14 \text{ in}^2 \]

Thus, the total area of the shape is 7.14 in².

So the correct response is: 7.14 in.²