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# Year 8 Angles

### Definitions and Facts from the NSW Year 8 Angles Topic

TermDefinition
angle sum he total of the angle sizes in a shape
compasses geometrical instruments for marking equal lengths or constructing circles
exterior angle an angle outside a polygon formed by extending a side of the polygon
perpendicular an interval or line constructed at right angles (90°) to another interval or line
supplementary two angles that add to 180°
right angle 90 degrees
complementary two angles that add to 90°
acute angle less than 90 degrees
obtuse angle greater than 90 degrees but less than 180 degrees.
reflex angle greater than 180 degrees but less than 360 degrees
adjacent angle angles next to each other, sharing a common arm and a common vertex.
alternate angles angles on parallel lines which are equal
cointerior angles angles on parallel lines which are supplementary
corresponding angles angles on parallel lines which are equal
equilateral triangle a triangle with three equal sides and angles
isosceles triangle two equal sides and two equal angles, opposite the equal sides
scalene triangle no equal sides or angles
vertex a corner or a point where the arms of an angle meet
Created by: wdobson