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Geometry Semester 1 Cheat Sheet by

Distance Formula

Slope Formula

Midpoint Formula

Types of Triangles

Proof

Terms

Acute Angle
Less than 90°
Adjacent Angle
Two angles on the same plane
Collinear Points
Two points on the same line
Comple­mentary Angle
Two angles whose sum is 90°
Midpoint
The point halfway between the endpoints of a segment.
Obtuse Angle
More than 180°
Ray
A point on a line and all points in one direction
Vertical Angles
Two nonadj­acent angles formed by two inters­ecting lines
Linear Pair
Adjacent angles whose non-common sides are opposite rays
Isoscles
At least two sides are congruent
Scalene
Nothing is congruent
Equila­teral
Every side is the same length
Bicond­itional
A and B are bi condit­ionally related if A implies B and B implies A.
Counte­rex­ample
a number which disproves a propos­ition For example, the prime number 2 is a counte­rex­ample to the statement "All prime numbers are odd."
Isometry
A isometry is a transf­orm­ation where distance (aka size) is preserved.
Preimage
Produced by reflection from a mirror, refraction by a lens, or the passage of luminous rays through a small aperture and their reception on a surface.
Transl­ation
A transf­orm­ation in which a graph or geometric figure is picked up and moved to another location without any change in size or orient­ation.
 

Types of Angles

Pythag­orean Theorem

Congruent Angles

Reflec­tions

Proof

Properties

   
 

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