19th term of an ap is equal to 3 times the 6th term, 9th term of an ap is 19 find the AP​

Which of the following is the result of expanding

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?

∆red ≅ ∆ by rule will give brainiest if possible