The width of the mirror is 5 dm and the length is 4 dm greater than the width. Find the area of the mirror.

univerkov | December 13, 2020 | education

First, we find the length of the mirror, knowing its dependence on the width by the condition:
5 decimetres + 4 decimeters = 9 decimeters.
The area of a rectangle, in our case, a mirror, will be the product of its sides.
S = 5 decimetres * 9 decimeters = 45 dm².
Answer: The mirror area is 45 dm².

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