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Names and Meanings:	Picture:
Adjacent angles Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap. Angle ABC is adjacent to angle CBD. Because: they have a common side (line CB) they have a common vertex (point B)
Alternative angles Two angles, formed when a line crosses two other lines, that lie on opposite sides of the transversal line and on opposite relative sides of the other lines. If the two lines crossed are parallel, the alternate angles are equal.
Acute angle Acute angle definition. An angle that measures less than ninety degrees but more than zero degrees. (Compare obtuse angle and right angle.)
Right angle An angle of 90°, as in a corner of a square, or formed by dividing a circle into quarters.
Obtuse angle Obtuse angle definition. An angle that measures more than 90 degrees but less than 180 degrees. (Compare acute angle and right angle.) The American Heritage® New Dictionary of Cultural Literacy, Third Edition. Copyright © 2005 by Houghton Mifflin Company.
Complementary angle Either of two angles whose sum is 90°.
Vertical angle Each of the pairs of opposite angles made by two intersecting lines.
Angles around a point Angles around a point will always add up to 360 degrees. The angles above all add to 360° 53° + 80° + 140° + 87° = 360° Because of this, we can find an unknown angle.
Sum of angles inside a triangle In a Euclidean space, the sum of measures of these three angles of any triangle is invariably equal to the straight angle, also expressed as 180°, π radians, two right angles, or a half-turn.
angles of an isosceles triangle Isosceles Triangle. ... A triangle which has two of its sides equal in length. Try this Drag the orange dots on each vertex to reshape the triangle. Notice it always remains an isosceles triangle, the sides AB and AC always remain equal in length. Hide details.
Supplementary angles Either of two angles whose sum is 180°
Co - interior angles When two lines are crossed by another line (which is called the Transversal), the pairs of angles: • on one side of the transversal. • but inside the two lines. are called Consecutive Interior Angles. When the two lines are parallel the Consecutive Interior Angles add to 180 degrees.
interior angle The angle between adjacent sides of a rectilinear figure.
isosceles triangle    In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
equilateral triangle In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.
Straight angle An angle of 180°.
Reflex angle The reflex angle is the larger angle. It is more than 180° but less than 360° If you choose the smaller angle you might have an Acute Angle, or an Obtuse Angle instead: The larger angle is a Reflex Angle, but the smaller angle is an Acute Angle.
Revolution angle Revolution. more ... A 360° angle, a full rotation, a complete turn so it points back the same way. Often used in the phrase "Revolutions Per Minute" (or "RPM") which means how many complete turns occur every minute.