Respuesta :
To find the cross product, you can set this up as a proportion. Please see the attached paper for one of the proportions you could use.
You would then multiply the numbers that are diagonal from each other.
You would have 21(8) = 12x or
168=12x.
You would then multiply the numbers that are diagonal from each other.
You would have 21(8) = 12x or
168=12x.

Answer:
multiply the base x height.
Step-by-step explanation:
B X H = AREA