4a. Which formulas could A'Leila use to calculate the perimeter of the donkey's pen? Be sure to select ALL that would work to calculate the perimeter.

Question

(2 points)
Responses

a + a + b + b

2 a + 2 b

a x b

a + 2b

Answer 1

To calculate the perimeter of a rectangular shape such as a donkey's pen, you would use a formula based on the lengths of its sides. The options provided are as follows:

1. a + a + b + b: This is correct because it adds each side individually (two sides of length 'a' and two sides of length 'b').

2. 2a + 2b: This is also correct. This formula is a shorthand way of saying that you have two sides of 'a' and two sides of 'b'.

3. a x b: This is incorrect because multiplying the lengths of the sides gives you the area, not the perimeter.

4. a + 2b: This is incorrect for the purpose of calculating the perimeter of a rectangle as it does not account for both lengths of 'a'.

So, the correct formulas to calculate the perimeter are:

• a + a + b + b
• 2a + 2b