Geometry

If the ratio of interior angle to exterior angle of a regular polygon is 5:1, find the number of sides.

Find the angle between the hour and minute hands at 10:10.

In a triangle ABC, if 2*angle A = 3*angle B = 6*angle C, find angle A.

Two angles are such that their difference is 20 and their sum is 100. Are they?

If a line is perpendicular to one of two parallel lines, it is:

In the figure, if l || m, find the value of x if the co-interior angles are (2x+5) and (3x-10).

Calculate the sum of the interior angles of a decagon.

The exterior angle of a triangle is 120 and the ratio of the interior opposite angles is 2:1. Find the larger interior opposite angle.