Basic Geometric Terms

Intro to Geometry - Vocab/Basics

BUILDING BLOCKS OF GEOMETRY

• POINT - an object in geometry that has zero dimension, and is represented by a dot

• LINE - an object that has one dimension, and extends infinitely

• PLANE - an object that has two dimensions, and extends infinitely

Multiple Choice

TRUE OR FALSE:

Through any two points, there is exactly one line.

• True

• False

Multiple Select

Check off the two kinds of lines that can happen at the same time.

• Parallel

• Perpendicular

• Intersecting

• Skew

ANGLES

• The intersection of two lines at a point (called a vertex)

• Measured in a unit called degrees

• When measuring, you use a tool called a protractor

Kinds of Angles

• Acute - Less than 90°

• Obtuse - Greater than 90°

• Right - Exactly 90°

• Straight - Exactly 180° (A straight line)

Multiple Choice

What kind of angle is this?

• Acute

• Obtuse

• Right

• Straight

Multiple Choice

What kind of angle is this?

• Acute

• Obtuse

• Right

• Straight

Multiple Choice

What kind of angle is this?

• Acute

• Obtuse

• Right

• Straight

Special Pairs of Angles

• Adjacent: " next to "

• Complementary " sum of 90° "

• Supplementary " sum of 180° "

• Vertical Angles "Across//always equal"

Multiple Select

What kind (or kinds) of angles are these:

• Adjacent

• Complementary

• Supplementary

• Vertical

Multiple Select

What kind (or kinds) of angles are these:

• Adjacent

• Complementary

• Supplementary

• Vertical

Multiple Select

What kind (or kinds) of angles are these:

• Adjacent

• Complementary

• Supplementary

• Vertical

Multiple Select

What kind (or kinds) of angles are these:

• Adjacent

• Complementary

• Supplementary

• Vertical

Multiple Select

What kind (or kinds) of angles are these:

• Adjacent

• Complementary

• Supplementary

• Vertical