The drawing shows an Isosceles triangle, work out the size of angle A

Pls! does anybody know a shortcut for answering these types of questions in the future?

Agraph of a trapezoid can have diagonals with slopes that are negative reciprocals and two pairs of adjacent sides that are congruent, true or false, and why

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?