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Geom 25 most imp

10th Geometry 25 most important vocab words

TermDefinition
point a precise location in space with no size
line a straight path that goes on forever both ways
plane a flat surface that extends infinitely in all directions
segment a straight path with two definite endpoints
ray a path with one endpoint that goes on forever
angle two rays that share the same endpoint
vertex the corner point where lines or rays meet
right angle an angle that measures exactly 90 degrees
parallel lines that never cross and stay equally apart
perpendicular lines that cross at a perfect 90-degree angle
polygon any closed shape made with straight lines
triangle a three-sided polygon
quadrilateral a four-sided polygon
circle all points equal distance from a center point
congruent shapes that are identical in size and shape
similar shapes with equal angles but different sizes
perimeter the total distance around the outside of a shape
circumference the distance around the outside of a circle
area the amount of flat space inside a shape
volume the amount of 3D space an object holds
radius the distance from a circle's center to its edge
diameter the distance across a circle through the center
theorem a math statement proven to be true
hypotenuse the longest side of a right-angled triangle
transformation moving a shape by sliding, turning, or flipping
 



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