geometry
posted by DEEK on .
a tree is standing upright.i want to cut it down at the base.how would i find out how tall it is. so that i could fall it without hitting any buildings.ie if it is 80 feet tall it should fall 80 feet?

Wait for a sunny day, not too near noon.
Stand next to it.
Measure your shadow, and the tree's shadow.
The tree's height will be in the same ratio as to your shadow. 
Shalonda notices that when she stands next to the flagpole, she casts a shadow that is 8 feet long and that the flagpole casts a shadow that is 28 feet long. Little Shalonda is 4 feet tall. How tall, to the nearest foot, is the flagpole?