Answer:
7.5 cm
Explanation:
The perimeter of a rectangle is the sum of the length of all its sides.
Perimeter of rectangle= 2(length +breadth)
Given: perimeter= 24 cm, breadth= 4.5 cm
Substitute the given information into the formula:
24= 2(length +4.5)
Divide both sides by 2:
length +4.5= 12
Subtract 4.5 from both sides:
length
= 12 -4.5
= 7.5
Thus, the rectangle is 7.5 cm long.