The area of a triangle is A = (b*h)/2:
(5 * 8)/2 = 20
Interior angles are the angles on the interior of a shape, for example the interior angles of a square are 90(degrees)
The answer to that question is 5
Ten percent of 640 is 64.
640/100=6.4
6.4*10=64.
There are many other ways to find this but that is the way I have always used :)
Hope this helps!
