Parallel Line Angles

// L2L1

L2

L1

h

fg

e

dc

ba

Or

Supplementary

All angles are…

Summary of Shape KeysZ is AIA congruent

X is Vertical Angles VA congruent

Same side of Step Ladder Corresponding angles CA congruent

C or U is Same Side Interior Angles SSI Supplementary

Remember I C U

One acute and One Obtuse then Supplementary

Both angles acute then congruent.

Both angles obtuse then congruent.

Branch off line means supplementary.

// L2L1

L2

L1

h

fg

e

dc

ba

Corresponding AnglesCA

Same Side of Step Ladder

// L2L1

L2

L1

h

fg

e

dc

ba

Alternate Interior AnglesAIA

// L2L1

L2

L1

h

fg

e

dc

ba

Alternate Exterior AnglesAEA

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side Interior AnglesSSI

// L2L1

L2

L1

h

fg

e

dc

ba

Corresponding AnglesCA

Same Side of Step Ladder

// L2L1

L2

L1

h

fg

e

dc

ba

Alternate Exterior AnglesAEA

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side Interior AnglesSSI

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side Exterior AnglesSSE

// L2L1

L2

L1

h

fg

e

dc

ba

Alternate Interior AnglesAIA

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side Interior AnglesSSI

// L2L1

L2

L1

h

fg

e

dc

ba

Vertical Angles VA

// L2L1

L2

L1

h

fg

e

dc

ba

Linear pairsSupplementary

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side of Step Ladder

Corresponding AnglesCA

// L2L1

L2

L1

h

fg

e

dc

ba

None but…

Supplementary

// L2L1

L2

L1

h

fg

e

dc

ba

None but…

Supplementary

// L2L1

L2

L1

h

fg

e

dc

ba

Vertical Angles VA

// L2L1

L2

L1

h

fg

e

dc

ba

Same Side of Step Ladder

Corresponding AnglesCA

L1 L2//

L1 L2

a b c d

e gf h

Same Side of Step Ladder

Corresponding AnglesCA

L1 L2//

L1 L2

a b c d

e gf h

Alternate Exterior AnglesAEA

L1 L2//

L1 L2

a b c d

e gf h

Same Side Exterior Angles SSE

L1 L2//

L1 L2

a b c d

e gf h

Alternate Interior Angles AIA

L1 L2//

L1 L2

a b c d

e gf h

Same Side Interior Angles SSI

L1 L2//

L1 L2

a b c d

e gf h

Same Side of Step Ladder

Corresponding AnglesCA

L1 L2//

L1 L2

a b c d

e gf h

Alternate Interior Angles AIA

L1 L2//

L1 L2

a b c d

e gf h

Same Side of Step Ladder

Corresponding AnglesCA

L1 L2//

L1 L2

a b c d

e gf h

None but… Supplementary

L1 L2//

L1 L2

a b c d

e gf h

Vertical Angles VA

L1 L2//

L1 L2

a b c d

e gf h

Alternate Exterior Angles AEA

L1 L2//

L1 L2

a b c d

e gf h

Linear Pairs Supplementary

L1 L2//

L1 L2

a b c d

e gf h

None but… Supplementary

Summary of Shape KeysZ is AIA congruent

X is Vertical Angles VA congruent

Same side of Step Ladder Corresponding angles CA congruent

C or U is Same Side Interior Angles SSI Supplementary

Remember I C U

One acute and One Obtuse then Supplementary

Both angles acute then congruent.

Both angles obtuse then congruent.

Branch off line means supplementary.