Question

arthur uses three 10 cm by 15 cm photos to make the following rectangle. arthurs rectangle 10 cm 15 cm what is the perimeter of arthurs rectangle? cm

Explanation:

Step1: Find the length of the new rectangle

Since each photo has a length of 15 cm and there are 3 photos placed side - by - side, the length of the new rectangle $l=15\times3 = 45$ cm. The width of the new rectangle $w = 10$ cm (the width of a single photo).

Step2: Use the perimeter formula

The formula for the perimeter of a rectangle is $P=2(l + w)$. Substitute $l = 45$ cm and $w = 10$ cm into the formula: $P=2(45+10)$.
First, calculate the sum inside the parentheses: $45 + 10=55$ cm. Then, multiply by 2: $P = 2\times55=110$ cm.

Answer:

110