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Geometry revision

Geometry Revision: terms & definitions

TermDefinition
vertex a corner
right angle 90 degrees
obtuse angle more than 90 degrees, less than 180
acute angle less than 90
straight angle measures 180
A line has 180 degrees
congruent 2 shapes that are exactly the same size
adjacent angles are next to each other
complementary angles angles that add up to 90
supplementary angles angles that add up to 180
revolution a full circle, 360 degrees
How many degrees in a triangle 180 degrees
A right angle triangle has a right angle
a right angle is shown by a square in the corner
a protractor measures angles
how many degrees in any quadrilateral 360 degrees
scalene triangle (Silly) has no sides or angles the same
isosceles triangle ( I see) 2 sides and angles the same
equilateral triangle all sides and angles the same
when naming an angle the vertex point is in the middle
in <GMK M is the vertex ( or corner)
in <MGK G is the vertex ( or corner)
in a right angle triangle the hypotenuse is the longest side and is opposite the right angle
vertically opposite angles are always equal/the same size
pentagon 5 sided
quadrilateral 4 sided
bisect cut in half or cross
vertical travels up and down
horizontal travels across
pythagoras theory axa + bxb = cxc
polygon means many sided shape
reflex angle bigger than 180 degrees, smaller than 360 degrees.
Created by: nicolenixon
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