Warmup involved finding mistakes in a completed triangle congruence proof. Passed back assessments, and looked at helpful hints to make proofs a little easier.
Notes from board
Homework
take notes on this video: direct link [Also! A QUIZLET with these definitions! link]
Warm up was 2 different triangle congruence proofs related to parallelograms. Launched unit on quadrilaterals by looking at some paintings, then did a taxonomy of quadrilaterals, making both a family tree and a Venn diagram. Practiced with this terminology using voting eggs to find the most specific name for given quadrilaterals.
Notes from board
Homework
none
Warm up involved proving the Exterior Angle Theorem. Learned about the properties of kites and trapezoids (including isosceles trapezoids) by recognizing congruent triangles formed by their diagonals. Made a detailed foldable for parallelograms that demonstrated all the interrelated features of the shapes and how some properties are inherited from their 'ancestors.' Gave out practice assessment.
Notes from board
Blank parallelogram foldable
Completed parallelogram foldable
Homework
complete the practice assessment the best you can, then check with solutions
[blank copy] [solutions]
Resources
angles of a parallelogram, helps with #1: link starts at 5mins
finding side lengths of a parallelogram, helps with #2: link starts at 3min
diagonals of a parallelogram, helps with #3: link starts at 8min
diagonals of a rectangle, helps with #4: link
angles within a rectangle, helps with #5: link starts at 6min
angles of a rhombus, helps with #7: link
remote interior angles example, helps with #8: link
base and vertex angles, helps with #9: link
angle chase involving isosceles triangle, helps with #10: link
proofs:
proof using midpoint and CPCTC : LINK
proof using parallel lines and cpctc: LINK
proof using an angle bisector: LINK
several proof examples: LINK
mixed examples of proofs: LINK