Task # 5: "Compute me!" Directions: Solve for the surface areas of the follow Triangle 1. base = 12 cm. 2. base = 9 cm. Square 3. length = 28 m. Rhombus 4. base = 23 m. 5. base = 15 cm. height = 18 cm. height = 14 cm. width = 28 cm height = 20 m. height = 19 cm.