Question 15
Peter stacks 15 identical cubes to get the figure below then paints all the surfaces. Given that the side length of one cube is 1cm. Calculate the area that Peter needs to paint in cm².
Editorial interpretation of hidden cubes: use two perpendicular stepped profiles 1,2,3,2,1 sharing their central three-cube column. This specifies the intended crossed staircase consistent with the stated total and drawing. Include the underside when counting all surfaces.
Editorial interpretation of hidden cubes: use two perpendicular stepped profiles 1,2,3,2,1 sharing their central three-cube column. This specifies the intended crossed staircase consistent with the stated total and drawing. Include the underside when counting all surfaces.