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Gr.9: Investigating Congruency and Similarity [PDF]

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Description

Author: Karelien Kriel

Number of pages: 7

Print: 2-on-1

Proving Congruency in Triangles

When are triangles congruent?

Example

Notes

The symbol for congruency

Why is congruency important?

Investigation 1: (S, S, S)

Investigation 2: (S, angle, S)

Investigation 3: (angle, angle, S)

Investigation 4: (R, H, S)

Conclusions form Investigations

Four conditions for congruency

How to formally write out a congruency problem

Example

Proving Similarity in Triangles

When are triangles similar?

Example

The symbol for similarity

Investigation 1 and 2: (angle, angle, angle)

Investigation 3: ratio

Conclusions form Investigations

Two conditions for similarity

How to calculate the sides of triangles

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