Geometry
17 May 2013
1) Place your Proof using CPCTC on your desk.
Be prepared to share your work.
2) Which of the following lengths would
determine a right triangle?
a. 16, 30, 34
b. 50, 120, 130
c. 21, 28, 35
d. all of the above
3) Find volume and surface area
of a hexagonal prism,
if a = 5, s = 7 and H = 12.
s
Objective
Students will review geometry topics and be
able to develop proofs using CPCTC.
Students will work timed problems, collaborate
with a partner to find/ correct errors and work
with their group.
DUE TUESDAY: Proofs using Similarity
DUE FRIDAY: Review Packet
BOOKS
TURN IN YOUR BOOK TO THE LIBRARY AS SOON
AS YOU ARE FINISHED WITH IT!
Do you want it to help study for the final?
THEN TURN IT IN Right after your final!
You won’t use it? Turn it in now! :0
Timed Slides
Circle properties
Area of sector
Triangle equality-- sum of two sides > 3rd
Slides copied from http://regentsprep.org/
retrieved May 15, 2013
3.
4
5
6
Now let’s check your answers!
Turn and Talk– chat with a partner for 5 minutes
- discuss any differences
WHOLE CLASS– REVIEW ANSWERS
Project Presentations
AUDIENCE- please take notes as students
present and work any problems that are given
PRESENTERS- Clear, concise; 3 – 5 minutes
AUDIENCE- Attentive, good listeners, taking
notes
Name
AA Similarity
Conjecture
Shortcut
If 2 angles of one triangle are congruent
to 2 angles of another triangle, then the
triangles are similar
SSS Similarity
Conjecture
If the 3 sides of one triangle are
proportional to the 3 sides of another
triangle, then the two triangles are
similar
If 2 sides of one triangle are proportional
to 2 sides of another triangle and the
included angles are congruent, then the
triangles are similar
SAS Similarity
Conjecture
Review Similarity Shortcuts
Explain
Explain
Read “Proofs Involving Similar
Triangles”
Read silently to yourself, highlighting or
underlining the answers to the following:
1) What are the similarity shortcuts?
2) Working backwards, what key question must
we ask? What is “the answer”?
3) What is the first reason given for each proof?
4) Where does the “prove…..” go in each proof?
Now let’s dig in and practice!!!
Debrief
What do you need to review to be ready for the
final exam?
Area/ Surface Area/Volume
Pythagorian theorem/ pythagoras in a box
Similarity- triangles/ shadows/ heights
Trigonometry- SOH CAH TOA
Circle Properties
Proof