Angles

• Measures below 90 degrees


  Acute
• Equal to 90 degrees

  Right
• More than 90 degrees but less than 180 degrees

  Obtuse
• Equal to 180 degrees

  Straight
• Adds up to 90 degrees


  Complementary Angles
• Adds up to 180 degrees


  Supplementary Angle
• Angles that are equal. If the rays forming the sides of the other are opposite rays.

  Vertical Angle
• Angles that have common sides and vertex

  Adjacent Angle
• Straight path of points with no beginning or end


  Line
• Contains one endpoint and extends forever in one direction

  Ray
• A portion of line with two common endpoints

  Segment
• Lines that come together at a point

  Intersecting lines
• Two lines that intersects at right angle

  Perpendicular lines
• Two or more lines that are in the same distance apart and never meets

  Parallel lines
• Line that crosses two or more lines

  Transversal lines
• Two angles on different sides formed INSIDE the two parallel lines

  Alternate Interior Angle
• Two angles on different sides formed OUTSIDE the two parallel lines

  Alternate Exterior Angle
• Angles on the same side, one interior, one exterior, but not adjacent


  Corresponding Angles
• Has three equal angles and three sides of the same length. All angle is equal to 60 degrees

  Equilateral triangle
• Has two equal sides and two equal angles

  Isosceles triangle
• The sum of all the measures of angles in any triangle is 180 degrees
• No equal sides or angles

  Scalene triangle
• It contains only acute angles and its interior angles are never more than 90 degrees


  Acute triangle
• Corresponding sides of similar triangles are proportional
• Contains one obtuse angle

  Obtuse triangle
• Contains right angle

  Right triangle
• Equal to the sum of two remote interior angles

  Exterior angle