(connect each value on the left with an equal value on the ...€¦ · if i tell you that triangle...
TRANSCRIPT
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Warmup
(Connect each value on the left with an equal value on
the right)
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CHECK HOMEWORK
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OBJECTIVE:
WHAT DOES CONGRUENT
MEAN???
≅ Symbol for
congruence!
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Some other symbols to know
∥ parallel
⊥ perpendicular
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Rigid Motions
• What are Rigid Motions???
• “Motions that preserve the size and shape of figures”
• Who can name some Rigid Motions that we know???
• Translations
• Rotations
• Reflections
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Congruent = same size, same shape
• All the angles are the same
• All the side lengths are the same
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Two Congruent Triangles…
If I tell you that triangle CAT is congruent to triangle DOG…
what else can you conclude? Tell me everything you know!
C
A TD
OG
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Complete Reflection Questions 1 and 2 on pg. 910
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Highlight! pg. 910
When you write a statement such as ABC DEF, you are also stating which parts are congruent!!!
Helpful Hint
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Given: ∆PQR ∆STWIdentify all pairs of corresponding congruent parts.
Angles: P S, Q T, R W
Sides: PQ ST, QR TW, PR SW
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If polygon LMNP polygon EFGH, identify all pairs of corresponding congruent parts.
Angles: L E, M F, N G, P H
Sides: LM EF, MN FG, NP GH, LP EH
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Two Congruent Quadrilaterals
M A
TH
S F
N U
Quadrilateral MATH is congruent to Quadrilateral SFUN
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Let’s Look at Example A on pg. 910
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Try Part B on pg. 910!
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Try Questions 3 – 5 on pg. 911
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Try Questions 6-7 on pg. 912
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Properties of Equality
Reflexive Property of Equality a = a
Symmetric Property of Equality If a = b then b = a
Transitive Property of Equality If a = b and b = c then a = c
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Highlight pg. 911
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What do we KNOW?
What are we trying to prove?
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pg. 912
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What do we KNOW?
What are we trying to prove?
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Try B on pg. 913
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Now try 8 – 12 on pgs. 913- 914
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