Posted by Cassie on .
You set up a makeshift greenhouse by leaning a square pane of glass against a building. The glass is 4.5 ft long and it makes a 30 degree angle with the ground. How much horizontal distance between the building and the glass is there to grow plants? Round to the nearest inch.

Geometry 
Reiny,
make a sketch, label the base distance as x
then cos 30° = x/4.5
x = 4.5cos30° = 3.897 inches or 4 inches to the nearest inch