Question

calculate the perimeter
​

Answer 1

Hii Dear Friend

To find the perimeter of a rectangle, add the lengths of the rectangle's four sides. If you have only the width and the height, then you can easily find all four sides (two sides are each equal to the height and the other two sides are equal to the width). Multiply both the height and width by two and add the results.

Answer 2

Answer:

Explanation:

For a rectangle, area is A = lw and perimeter is P=2l+2w, where l is the length and w is the width.

Let x = length and x-4 = width.

The area equation to solve becomes x(x-4)=96, or x^{2}-4x-96=0.

To factor, find two numbers the sum to -4 and multiply to -96. -12 and 8 will work:

x2 + 8x - 12x - 96 = 0

x(x + 8) - 12(x + 8) = 0

(x - 12)(x + 8) = 0

Set each factor equal to zero and solve:

x=12 or x=-8.

Therefore the length is 12\; cm and the width is 8 \; cm, giving a perimeter of 40\; cm.