The area of a rhombus is p x q divided by 2.
p and q are both the diagonals of the shape.
In this case, we would do 10 x 5.2 divided by 2, which gives us 26, so your answer is 26 cm^2 (squared).
Hope this helps!
Hi.... Your answer is below...

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Answer:
multiplication prop of equality, (multiplying both sides by 6)
simplifying, (not distrib prop as there is no parentheses)
Addition prop of equality, (adding 18 to each side)
simplifying