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# Geometry revision

### Geometry Revision: terms & definitions

TermDefinition
vertex the point where 2 rays meet
right angle measures 90 exactly
obtuse angle measures more than 90 degrees, less than 180
acute angle measures less than 90
straight angle measures 180
A line has 180 degrees
congruent is identical in size and shape
adjacent angles are next to each other, share a common side and the same vertex
complementary angles 2 or more angles that add up to 90
supplementary angles 2 or more angles that add up to 180
revolution a full circle, 360 degrees
a triangle's internal angles equals 180 degress
right angle triangle has a right angle
a right angle is shown by a square in the vertex
acute triangle are when all angles are less than 90
obtuse angle has an angle that measures more than 90
scalene triangle has no sides or angles the same
isosceles triangle has 2 sides and angles the same
equilateral triangle has 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