1. The sides of AB and AC of a triangle ABC are produced to D and E respectively such that DBC=125° and BCE=95°, find the value of BAC.
2. In a triangle ABC, BAC = 48° and ABC=100°, calculate the acute angle between the internal bisectors of ABC and BCA.
3. The angles of a quadrilateral are 4x, x+10, 9x-30 and 3x+20. The value of x is ...
4. Each of the exterior angle of a regular polygon is 24°. How many sides has the polygon?
5. Each interior angle of an eight-sided polygon is equal to ...
6. The interior angles of a pentagon are 130°, 118°, 80°, 78° and x. Find the value of x
7. The ratio of the interior angle to to the exterior angle in a regular polygon is 1.4, what is the number of sides
8. The two adjacent angles on a straight line are (x-60) 0 and (y+30). The value of x+y is
9. Calculate the sum of angles in a regular decagon
10. When two straight lines cross each other, which angle is formed
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