Hello there! I can help you! The surface area is where you add the areas of the shapes to find the area of the surface. 15 is the side of the square. We can raise 15 to the second power (15²) to get 225. The total surface area is 945 square feet. Let's subtract 225. 945 - 225 is 720. There are 4 triangles. 720 square feet is the sum of the surface area of 4 triangles so let's divde 720 by 4 to find the area of each triangle. 720/4 is 180. The area of each triangle is 180. But we're not done. We need to look for the height. The formula for the area of the triangle is 1/2 the product of base and height. (½bh) When we divide by 2, our answer should be 180. So the product of the two numbers should be 360. We know that the base is 15ft long, so let's divide. 360/15 is 24. 15 * 24 is 360. 360/2 is 180. There. The height of each triangular base is 24 ft.
