(Score for Question 2: _ of 4 points) 2. A contractor is building a set of stairs out of concrete. Each stair is exactly the same length, width, and height. 1.8 m 1.2 m 2.4 m (a) Which solid figures can the stairs be broken into? What are the dimensions of each solid figure? (b) How much concrete will be needed to form the stairs? ​