Sylvia is correct. This is because the sum of angles in a triangle is 180° and a triangle has 3 angles. If it had 2 right angles (90° each) it would already equal 180° and that's not possible because a thrid angle has to exist.
Area of a triangle = base x height / 2 64 = base x height / 2 (multiply 2 on both sides) 128 = base x height then if base= 16 and height = 8 then 16 x 8 = 128 thus the base is 16 which is twice the height:8