Geometry basics

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This set has basic Geometry terms to begin learning geometry.

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33 Terms

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Net diagram
A 2d pattern that you can fold to form a 3d figure shows all surfaces in one view
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orthographic drawing
the top view, front view, and right view of a 3D figure
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Isometric
A form of pictorial drawing in which all three drawing axes form equal angles of 120 degrees with the plane of projection.
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point -
A location in space. shown with capital letter
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line
a straight path that extends without end in opposite directions

named by points on line or lowercase letter
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plane
\- flat surface named with capital letter or three letters on plane
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segment
\- part of a line with two endpoints
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ray
\- a part of a line that starts at an endpoint and extends forever in one direction
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opposite ray
- two rays that have a common endpoint and form a line
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colinear points -
points that lie on the same line
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coplanar
- points that lie on the same plane
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space -
the set of all points
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postulate -
a statement that is accepted as true without proof
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intersection
- A point where lines intersect.
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congruence
\- same size and shape
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midpoint
\- A point that divides a segment into two congruent segments
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Bisector
\- a ray that divides an angle into two congruent angles
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angle
A figure formed by two rays with a common endpoint
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adjacent angle
Angles that have a common side and a common vertex (corner point).
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vertical angles -
A pair of opposite congruent angles formed by intersecting lines
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complementary angles -
Two angles whose sum is 90 degrees
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supplementary angles -
Two angles whose sum is 180 degrees
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Linear pair -
A pair of adjacent angles whose noncommon sides are opposite rays form straight line.
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Midpoint formula on a number line -
M=a+b/ 2
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Midpoint formula on a coordinate plane -
(x₁+x₂)/2, (y₁+y₂)/2
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square area -
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triangle area -
1/2bh
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rectangle area -
Bh
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circle area -
πr²
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circumference
\- 2πr
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diameter
\- A straight line passing from side to side through the center of a circle or sphere.
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radius formula
\- r=d/2
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Distance Formula -
d = √\[( x₂ - x₁)² + (y₂ - y₁)²\]