ANGLES 8°
Presentation
•
Mathematics
•
8th Grade
•
Practice Problem
•
Easy
Standards-aligned
Catalina Lopez Campuzano
Used 3+ times
FREE Resource
13 Slides • 3 Questions
1
ANGLES 8°
2
TOPICS
Angles
Parallel lines
Explaining angle properties
Solving Angle Problems
3
ANGLES
Remember that the angles of a triangle add up to 180°.
¿How did you find out that this is true?
See the image
4
PARALLEL LINES
Here are two parallel lines. The arrows show they are parallel.
If two lines are parallel the perpendicular distance between them is the same wherever you measure it.
5
PARALLEL LINES
Here is another pair of parallel lines. A third straight line crosses them. This is called a transversal.
Angles are formed where the transversal crosses the parallel lines.
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PARALLEL LINES
The angles marked a and e are called corresponding angles.
The angles marked d and h are also corresponding angles.
So are b and f, and c and g.
CORRESPONDING ANGLES ARE EQUAL.
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PARALLEL LINES
The angles marked d and f are called alternate angles. Angles c and e are also alternate angles.
ALTERNATE ANGLES ARE EQUAL.
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PARALLEL LINES
To hel you remember: For corresponding angles, think of the letter F.
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PARALLEL LINES
For alternate angles, think of the letter Z.
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Multiple Choice
The sum of the angles of any triangle is equal to
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Multiple Choice
12
Multiple Choice
13
EXERCISE
In the diagram, the size of one angle is 62°. Copy and complete these two sentences:
a. Because corresponding angles are equal, angle ____=62°
b. Because alternate angles are equal, angle ____=62°
14
EXERCISE
In the diagram, the sizes of two angles area marked.
a. What other angles are 105°?
b. What other angles are 75°?
15
EXERCISE
Look at the diagram.
Explain why AB and CD cannot be parallel lines.
16
EXERCISE
In this diagram there are two pairs of parallel lines:
a. Write down two pairs of corresponding angles that include the angle marked i.
b. Write down two pairs of alternate angles that include the angle marked o.
ANGLES 8°
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