The perimeter of a rectangle is 30cm. If the width is 5cm. What is it's length
Show workings
Let L be the length of the rectangle.
The formula for the perimeter of a rectangle is:
P = 2(L + W)
where P is the perimeter, L is the length and W is the width.
In this problem, the perimeter P is given as 30cm and the width W is given as 5cm. So we can substitute these values into the formula and solve for L:
30 = 2(L + 5)
Divide both sides by 2:
15 = L + 5
Subtract 5 from both sides:
L = 10
Therefore, the length of the rectangle is 10cm.