Rhombus - diagonals

Rhombus ABCD has diagonals u₁ and u₂ that make an angle of 60° with each other. Side a = 80 cm and side b = 50 cm.
Calculate the area of the rhombus.

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

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Pythagorean theorem
area of a shape
triangle
diagonal
rhomboid
law of cosines

Units of physical quantities

unit conversion
angle

Grade of the word problem

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