Helen is trying to determine the volume of a figure made from two rectangular prisms as shown in the figure. One prism has the dimensions of 1 cm by 1 cm by 1 cm. What are the dimensions of the other prism? 2 prisms are joined together to make 1 figure. The tall prism is 1 centimeter wide and 1 centimeter long. Its height is 3 centimeters. The length of the small and tall prism together is 3 centimeters. The small prism is 2 centimeters tall and 1 centimeter wide. A 1 cm by 2 cm by 2 cm B 1 cm by 1 cm by 3 cm C 3 cm by 3 cm by 2 cm D 1 cm by 2 cm by 3 cm