A rectangle is 15 cm by 7 cm. What is the perimeter
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A rectangle is a four-sided shape where all angles are right angles, and opposite sides are equal in length. Let's look at the key properties of a rectangle.
The perimeter of a shape is the total distance around its outside edge. Imagine walking around the rectangle - the distance you walk is the perimeter.
We are given a rectangle with dimensions 15 centimeters by 7 centimeters. This means the length is 15 cm and the width is 7 cm. Since opposite sides of a rectangle are equal, we have two sides of 15 cm and two sides of 7 cm.
To find the perimeter of a rectangle, we add up all four sides. Since opposite sides are equal, we have length plus width plus length plus width. This can be simplified to two times the length plus two times the width, or two times the sum of length and width.
Now let's calculate the perimeter using the formula. We substitute our values: length equals 15 centimeters and width equals 7 centimeters. First we add 15 plus 7 to get 22. Then we multiply by 2 to get 44 centimeters.
Let's verify our answer by adding all four sides individually: 15 plus 7 plus 15 plus 7 equals 44 centimeters. This confirms our formula calculation. To summarize: we learned that a rectangle has four right angles, perimeter is the distance around a shape, the rectangle perimeter formula is P equals 2 times the sum of length and width, and our answer is 44 centimeters.