MathIsimple

Lines & Angles

Master the fundamentals of geometry: learn about lines, rays, segments, angle types, angle relationships, parallel lines, perpendicular lines, and transversals.

Geometry
Beginner
~45 min
Angle Calculator
Find complementary, supplementary, or missing triangle angles
1. Lines, Rays, and Segments

Line

Extends infinitely in both directions. Has no endpoints.

←————————→

Notation: AB↔\overleftrightarrow{AB}

Ray

Has one endpoint, extends infinitely in one direction.

A•————————→

Notation: AB→\overrightarrow{AB}

Line Segment

Has two endpoints. A finite portion of a line.

A•————————•B

Notation: AB‾\overline{AB} or AB

2. Types of Angles
3. Angle Relationships
4. Parallel Lines & Transversals
5. Perpendicular Lines

Practice Quiz

Practice Quiz
20
Questions
0
Correct
0%
Accuracy
1
What is a line in geometry?
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2
What is a ray?
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3
What is a line segment?
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4
Two angles that sum to 90°90° are called:
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5
Two angles that sum to 180°180° are called:
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6
When two lines intersect, the opposite angles are called:
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7
If two lines are parallel, what can we say about their intersection?
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8
Two lines that intersect at a 90°90° angle are called:
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9
If angle A and angle B are vertical angles and angle A = 65°65°, what is angle B?
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10
If two angles are supplementary and one angle is 110°110°, what is the other angle?
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11
When a transversal crosses two parallel lines, corresponding angles are:
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12
Alternate interior angles formed by a transversal crossing parallel lines are:
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13
An angle measuring exactly 90°90° is called:
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14
An angle measuring between 0°0° and 90°90° is called:
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15
An angle measuring between 90°90° and 180°180° is called:
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16
A straight angle measures:
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17
Co-interior angles (same-side interior angles) formed by a transversal crossing parallel lines are:
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18
If angle A = 35°35° and angle B is its complement, what is angle B?
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19
How many degrees are in a full rotation?
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20
If two parallel lines are cut by a transversal and one angle is 72°72°, how many of the eight angles formed are 72°72°?
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