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# Geometry

### Angles & Triangles

Angle When two lines meet at a point (Vertex)
Vertex The point where the two arms of an angle meet
Protractor The device for measuring angles
Degrees' The unit used to measure angles
Constructing Angles Drawing an angle accurately with a protractor
Acute Angle An Acute angle is greater than zero', but less than 90'
Right Angle A Right Angle is exactly 90'
Obtuse Angle An Obtuse Angle is greater than 90' but less than 180'
Straight Angle A Straight Angle is exactly 180'
Reflex Angle A Reflex Angle is greater than180' but less than 360'
A Revolution or Perigon A Revolution or Perigon is an angle of 360' A full circle
Complementary Angles Complementary Angles are 2 or more angles that add up to 90'
Supplementary Angles Supplementary Angles are 2 or more angles that add up to 180'
< symbol The < symbol is saying "the angle of"
Writing the angle name, we use < and _________ _________ letters Three Capital letters
The three angles in any Triangle added up to ________ 180'
The three triangle according to their sides are called Equilateral, Isosceles and Scalene Triangles
An Equilateral Triangle has All sides equal in length All angles equal 60'
An Isosceles Triangle has Two sides of equal length Opposite angles are equal
A Scalene Triangle has No equal sides No equal angles
The three Triangles according to their angles are called Right- angled triangle, Acute- angled triangle and an Obtuse- angled triangle
A Right -angled triangle Has ONE angle that equals 90'
An Acute-angled triangle Has ALL angles smaller than 90'
An Obtuse-angled triangle Has ONE angle GREATER than 90' ( less than 180')
Interior Angle refers to Refers to the angles inside the triangle
Exterior Angles refers to Refers to the angle outside the triangle
Created by: Tania L Kremers
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