Diamond diagonal area

The KLMN diamond has a circumference of 32 cm, and the intersection of its diagonals is 3 cm away from the LM side. What is the area of the diamond?

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You need to know the following knowledge to solve this word math problem:

algebra

rearrange variables

planimetry

area of a shape
perimeter
rhombus
rectangle

Grade of the word problem

practice for 13 year olds
practice for 14 year olds

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