Answer: Finding the area for a right triangle is really simple so I will just show you how too.
Explanation:
I was taught that it was H × B ÷2 (make sure to use this formula on right triangles)
B=base
H=height
Its really similar to finding area of a rectangle but you just divide your answer by 2 at the end!
I hope that helps a bit.
(if you worried that you didn't do it correct I got 336 for number 1)