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| Question | Answer |
| a = b | Vertically opposite angels are equal. vert. opp. <'s |
| a + b = 180 | Adjacent angels on a straight line add to 180. adj. <'s on st. line |
| a + b + c = 360 | Angles at a point add to 360. <'s at pt. |
| (transversal) a = b | Corresponding angels on parallel lines are equal. corresp. <'s, // lines. |
| a = b | Alternate angels on parallel line are equal. alt.<'s, // line. |
| a + b = 180 | Co-interior angles on parallel lines add to 180. co-int. <'s, // lines |
| Angels in a triangle add to 180. < sum of ^ | |
| a = b | The base angles of an isosceles triangle are equal. base <'s isos. ^ |
| Each angle in an equilateral triangle is 60. < in equailat. ^ | |
| a + b = c | The exterior angle of a triangle equals the sum of the two interior opposite angles. ext. < of ^ |
| Interior angles in a quadrilateral add up to 360. < sum of quad. | |
| Sum= 180 x (5-2) = 180 x 3 = 540 | The interior angles of a polygon: Sum= 180 (n-2)*, where n is the number of sides. int. < sum of polygon |
| a + b + c + d = 360 | The exterior angles of a polygon add to 360 ext. < sum of polygon |
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