Geometry question

Question

Harry is standing 30 feet from the base of a building . The angle of elevation of the top of the building is 80 degrees Find the height of the building to the nearest foot .

Answer 1

Can form a right triangle where the height of the building is the side opposite to the angle of elevation and the distance from Harry to the base of the building is the side adjacent to the angle of elevation. Which trig function of the angle of elevation would you use for opposite/adjacent?