The missing height is 5 inches.
The height parallel to the missing height is 15, subtract 10 to find 5.
Answer:
Option B. 
Step-by-step explanation:
we know that
The area of a triangle is equal to

we have


Convert mixed numbers to an improper fractions


substitute the values

DEC=72 degrees. The two angles equal each other so you much set them to equal each other.
Negation...means put " not " in both the hypothesis and conclusion
if a parallelogram DOES NOT have 4 congruent sides, then it is NOT a rhombus.