Review & Trapezoids
Properties of a Parallelogram A BC D 1. Opposite sides are parallel. 2 Opposite sides are congruent. 3. Opposite angles are congruent. 5. Diagonals bisect each other 4. Consecutive angles are supplementary YES, we’re going to review again, & again, & again…
Properties of a Rhombus ABCD 1. Opposite sides are parallel. 2 Opposite sides are congruent. 3. Opposite angles are congruent. 5. Diagonals bisect each other 4. Consecutive angles are supplementary 6. 4 congruent sides 7. Diagonals of a rhombus bisect the angles 8. Diagonals of a rhombus are perpendicular (bisectors)
Properties of a Rectangle 1. Opposite sides are parallel. 2 Opposite sides are congruent. 3. Opposite angles are congruent. 5. Diagonals bisect each other 4. Consecutive angles are supplementary 6. 4 congruent sides 7. Diagonals of a rhombus bisect the angles 8. Diagonals of a rhombus are perpendicular (bisectors) 9. 4 right angles 10. Diagonals are congruent
Properties of a Square 1. Opposite sides are parallel. 2 Opposite sides are congruent. 3. Opposite angles are congruent. 5. Diagonals bisect each other 4. Consecutive angles are supplementary 6. 4 congruent sides 7. Diagonals of a rhombus bisect the angles 8. Diagonals of a rhombus are perpendicular (bisectors) 9. 4 right angles 10. Diagonals are congruent It has it ALL!!!
Practice with squares A B CD BX= AX = DB = AC = AB= BC= 12 X DX = 8.5 m AXB= m XAB=90 45
And now…Properties of Trapezoids
Definition of a Trapezoid- exactly one pair of parallel sides OR A quadrilateral with:
Definition of a Trapezoid- Parallel sides are called BASES base leg Other nonparallel sides are called LEGS
Definition of an ISOSCELES Trapezoid- A trapezoid with Congruent legs base leg AND Congruent base angles
Name the following for trapezoid RSTW R S WT THE BASES: THE LEGS: ONE PAIR OF BASE ANGLES R & S ; or T & W
Median of a Trapezoid A M D B N C The median of any trapezoid is parallel to the bases The median is equal to half the SUM of the base lengths A median (MN) is a segment connecting the midpoints of the legs MN = 10 > > (sum of bases) (half of sum)
Examples – find the length of the median x 21+x
EF= m 1= m 2= m 3= m 4= m 5= 2 78 A B C D E F 102 78 50 130 Isosceles trapezoid? Corr s Base s Same Side interior - supplementary Corr s Same Side interior - supplementary
EF= m 1= m 2= m 3= m 4= m 5= 2 51 E F J K L M 129 51 129 51 Isosceles trapezoid?