Question

A book had a length of 5 inches and a width of 10 inches. what is the perimeter?

Answer 1

30 inches.
When trying to find the perimeter of a rectangle, add the lengths of all of the sides. So, 5 + 5 + 10 + 10 = 30.

Answer 2

The formula for perimeter is P = 2length + 2width (P = 2L + 2W)

In this case:

Length = 5 in

Width = 10 in

Plug what you know into the perimeter formula:

P = 2(5) + 2(10)

OR

P = 2 × 5 + 2 × 10

To solve this you must use the rules of PEMDAS (Parentheses, Exponent, Multiplication, Division, Addition, Subtraction)

First we have multiplication. Remember that when solving you must go from left to right

P = 2 × 5 + 2 × 10

2 × 5 = 10

P = 10 + 2 × 10

2 × 10 = 20

P = 10 + 20

Now we have addition:

P = 10 + 20

P = 30

The perimeter of this book is 30 inches

Hope this helped!

~Just a girl in love with Shawn Mendes