a = 8, b = 15, and c = 17.
Checking to see whether or not this is a right triangle: does 82 + 152 = 172 ?
Yes, it does, so we can use the formula Area = ½·base·height
Let the base be 8 and the height be 15 (or you can do it the other way): Area = ½·8·15 = ...