Answer:
2100 square cm
Step-by-step explanation:
To find the AREA of a three-dimensional, non-circular figure, you would want to multiply length by width by height ( 20 x 7 x 15). Since we're just looking for area and not volume, this is the equation we'll be going with.
20 x 7 x 15 = 2100
Add in the units, and we get 2100 square cm.
Hope I could help.