**Tomorrow's quiz will be on cross multiplying and parallel lines with transversals.**

**Cross Multiplying Steps**

x + 1 2

____ = ____

12 3

- Circle the unknown (x+1)

- Multiply the diagonals (12 x 2 = 24)

- Divide by the other number (24 divided by 3 = 8)

- So if the unknown is 8, then x+1 = 8

- Which means x must be 7

x = 7

**Names of Angles:**

< 1 and < 3 are VERTICALLY OPPOSITE

< 2 and < 4 are VERTICALLY OPPOSITE

< 5 and <7 are VERTICALLY OPPOSITE

< 8 and <6 are VERTICALLY OPPOSITE

< 1 and < 5 are CORRESPONDING ANGLES

< 2 and < 6 are CORRESPONDING ANGLES

< 4 and < 8 are CORRESPONDING ANGLES

< 3 and < 7 are CORRESPONDING ANGLES

<1 and < 2 are SUPPLEMENTARY ( add up to 180)

< 8 and < 7 are SUPPLEMENTARY ( add up to 180)

< 4 and < 3 are INTERIOR SUPPLEMENTARY ( add up to 180)

< 5 and < 6 are INTERIOR SUPPLEMENTARY ( add up to 180)

< 1 and < 7 are ALTERNATE EXTERIOR ANGLES

< 2 and < 8 are ALTERNATE EXTERIOR ANGLES

< 4 and < 6 are ALTERNATE INTERIOR ANGLES

< 5 and < 3 are ALTERNATE INTERIOR ANGLES