Can anyone help with this math problem

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

Iwill give you ! what is the measure of ∠v ?