Lines AB and CD intersect at O. If ∠AOC = (3x - 10 )^o and ∠BOD = (20 - 2x )^o , find the value of x .

If ∠X = 90^o - ∠Y , then ∠X and ∠Y are _________ angles.

∠ABD and ∠CBD form a linear pair of angles if A,B and C are 

If two parallel lines are intersected by a transversal, then interior , angles on the same side of the transversal are 

Measures of a pair of supplementary angles are in the ratio 23 : 22.The angles are

In the given figure, AOB is a straight line.Rays OC and OD stand on AB.The value of x is.

In ΔABC, ∠A : ∠B : ∠C = 2 : 3 : 5 , then interior angle at B is

If the complement of a angle is equal to the supplement of 4 times the angle.Then the measure of the angle is

Supplement of an angle is one fourth of itself.The measure of the angle is

If two lines intersect each other, the vertically opposite angles are