Area formula: find a missing measurement
Apply the area formula for a rectangle to find the area given two side lengths, or to find a missing side length given the area and one side. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A poster measures 5 m by 4 m. What is its area?
Answer: 20
See one solved, step by step
A bookshelf back panel has an area of 54 m^2 and a width of 6 m. What is its length?
📘 Worked solution
1Area = length · width, so length = Area / widthUndo the multiplication by dividing.
254 / 6 = 9Divide the area by the known side to find the missing side.
3Length = 9 mThat's the missing measurement.
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