How do you find the apothem of a shape??

Mrs.renoir has completed the interior portion of a quilt top measuring

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.