Answer:
false
Step-by-step explanation:
120
A= bh 1/2
15 x 16 = 240
240/2
120
Answer: isosceles
Step-by-step explanation:
By the alternate interior angles theorem, 
Since angles in a triangle add to 180 degrees, 
Since sides opposite equal angles in a triangle are equal,
.
So, triangle ABC is <u>isosceles</u>
X is usually the representation for the unknown number.
For the first one, the answer is -51
I'm sorry, but I don't know the answer for the second one. Either way, I hope this helped you.