# 1.8: Study Guide

**At Grade**Created by: CK-12

Keywords: Define, write theorems, and/or draw a diagram for each word below.

Geometry

Point

Line

Plane

Space

Collinear

Coplanar

Endpoint

Line Segment

Ray

Intersection

Postulates

Theorem

Postulate 1-1

Postulate 1-2

Postulate 1-3

Postulate 1-4

Postulate 1-5

Use this picture to identify the geometric terms in this section.

**Homework:**

Distance

Measure

Ruler Postulate

Segment Addition Postulate

**Homework:**

Angle

Vertex

Sides

Protractor Postulate

Straight Angle

Right Angle

Acute Angles

Obtuse Angles

Perpendicular

Construction

Compass

Angle Addition Postulate

**Homework:**

Congruent

Midpoint.

Midpoint Postulate

Segment Bisector

Perpendicular Bisector

Perpendicular Bisector Postulate

Angle Bisector

Angle Bisector Postulate

**Homework:**

Complementary

Supplementary

Adjacent Angles

Linear Pair

Linear Pair Postulate

Vertical Angles

Vertical Angles Theorem

**Homework:**

Draw your own pictures for this section

Triangle

Right Triangle

Obtuse Triangle

Acute Triangle

Equiangular Triangle

Scalene Triangle

Isosceles Triangle

Equilateral Triangle

Vertices

Sides

Polygon

Convex Polygon

Concave Polygon

Quadrilateral, Pentagon, Hexagon, Heptagon, Octagon, Nonagon, Decagon…

Diagonals

**Homework:**

### Image Attributions

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