Angle AOE has what measurment according to the protractor

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?