1. Warm Up

2. HW Check

3. CIRCLES and POLYGONS

4. Given (x1, y1) and (x2, y2) Formulas to Remember: Distance Formula:
Slope Formula:
Midpoint Formula:

5. Parallel and Perpendicular Lines
Parallel Lines- HAVE THE SAME SLOPE
Perpendicular Lines: HAVE OPPOSITE RECIPROCAL SLOPE (form right angles!)
Remember slopes of zero and undefined are always perpendicular!!!
Show symbols for parallel & perpendicular

6. Name as many 4 sided polygons as you can!
Quadrilaterals
A four sided polygon.
(a four sided shape!)
Name as many 4 sided polygons as you can!

7. Parallelogram
A four sided figure with opposite sides parallel. AB is parallel to _________ AD is parallel to _________

8. Rectangle A four sided figure with 4 right angles and opposite
congruent sides.
Proving right angles…
DC is ____________ to CB CB is ____________ to AB
AB is ____________ to DA DA is ____________to DC
Proving opposite sides congruent…
DC is congruent to __________
DA is congruent to ___________
Show symbol for congruent.

9. Square A figure with all sides congruent, and four right angles.
Proving right angles…
DC is ____________ to CB CB is ____________ to AB
AB is ____________ to DA DA is ____________to DC
Proving four congruent sides…
Show that DC has the same ______________ as
__________ , _____________, and _____________.

10. How to prove….
Sides are congruent In the coordinate plane if lines are vertical or horizontal  count the units! If they are not vertical or horizontal  use the distance formula. Sides are parallel (same slope) Use rise over run or the slope formula Sides are perpendicular (opposite reciprocal slopes)

11. Formulas to know…
Rectangle Area = Length * Width Perimeter = 2L + 2W Square Area = Length * Width (or A = side2) Perimeter = 4*side length

12. Circle Set of points equal distant from the center. To find area:
Circumference is the “perimeter” of the circle
How to find circumference:
Diameter is 2 * radius.