Parallel Lines & Transversals

By Victoria Miles

Activator Problem

Solution:

m<1 = 60o. (given)

m<3 = m<5 =m<7 =60o

m<2, m<4, m<6, m<8 = 120o.

Perpendicular and Parallel Lines

BrainPop MOVIE click here

Mr. Vaugh’s flash movie click here

Congruent Angles

More Definitions

• Perpendicular lines are lines that intersect

at right angles.

• Parallel lines are lines that never intersect.

• A transversal is a line that intersects two

or more lines.

Special Types of Angles

Click here to interact:

Vertical Angles

Corresponding Angles

Alternate Interior Angles

Summary• Parallel lines are lines that never meet.• Perpendicular lines meet at right angles.• A transversal is a line that intersects 2 or more

(parallel) lines.• Parallel lines cut by a transversal form 8 angles.• Pairs of angles will be either congruent or

supplementary.• Special pairs of angles will be congruent.

– Vertical angles– Corresponding angles– Alternate Interior Angles

Interactive math dictionary

Your turn!

Find the measure of the other angles.

105o

Try this one!

Solve for a, b, c, d, x, y and z

x 65o

y + 20z

a - 10 b

5c

d ÷2

More special angles…

• http://www.shodor.org/interactivate/activities

• Sources• http://www.mathsisfun.com

• http://www.algebra.com • http://www.teachers.ash.org.au/jeather/maths/dictionary.htm

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