Answer:
100 cm.
Step-by-step explanation:
We have been given that a rectangle has a width of 10 centimeters. The rectangle's length is 4 times its width.
The length of rectangle would be \(4\times 10\text{ cm}=40\text{ cm}\).
We know that perimeter of rectangle is 2 times the sum of length and width of rectangle.
\(\text{Perimeter of rectangle}=2(\text{Length+Width)}\)
\(\text{Perimeter of rectangle}=2(\text{10 cm+ 40 cm)}\)
\(\text{Perimeter of rectangle}=2(\text{50 cm)}\)
\(\text{Perimeter of rectangle}=100\text{ cm}\)
Therefore, the perimeter of our given rectangle would be 100 cm.
