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Get Materials!Get Materials!

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Homework Answers…Questions?1. 2 – vertical, 5 – corresponding, 6 – alt. ext. 2. 6 – vertical, 4 – corresponding, 2 - alt. int.3. 2 – vertical, 4 – corresponding4. 6 – vertical, 11 & 4 – corresponding, 9 & 2 – alt.

int., 13 & 15 – corresponding to 2 & 115. 1 = 45o (alt. int.)2 = 135o (linear pair)6. 1 = 65o (same-side ext.) 2 = 115o

(corresponding)7. 1 = 95o (alt. int.)2 = 130o (same-side int.)8. a) measure of angle 1 = 105o

b) same-side interior

Why does it matter?

Light technology and Mirror Reflection

What are we learning today?

Proving lines are parallel (the converses of

the angle theorems)

Section 2.1.5

Warm up in pairs Title classwork 2.1.5 Classwork

Complete textbook pg 92 # 38

Together Now! Turn to page 93 #43 Volunteers to read?

Use those theorems in reverse! #44

44A)

44B)

44C)

44D)

Converses and Parallel Notation Converse – switch the “If and then”

in a theorem The notation for parallel lines are 2

slashes between the lines that are parallel

Example: m // nwould read m is parallel to n.

m

n

Prove these lines are parallel! (#45)

Hooray!

If we got here before the bell, then we all get a break!

Somebody’s Watching Me part 2 Read # 46 together for set up Complete #47 with your partner

using the angle I assign you Copy the diagram onto

your classwork when

filling in angles

Answers to 47a

Answers continued

47b)

47c)

Putting it all together.

#49) Calculate the measures of x, y, and z. Justify each answer with the name of a geometric relationship from your toolkit.

Practice makes perfect! Complete #51 with your partner. I will have a pair share answers on the

board.

Homework

Textbook pg 97 #52 all If you want full credit:

-set up an equation

-show work

-solve for x