Section 4.1

Section 4.1Congruent Polygons

Section 4.1

How do we know if two figures are congruent?1. All of the matching sides are the same2. All of the matching angles are the same

Basically, the shapes are identical to each other.

Section 4.1

Naming two congruent shapes with a Congruence Statement.When stating that two shapes are congruent it is important that the letters of each shape are written in the same order.

Example:

Polygon ABCDE = Polygon __________XMLPQ

Section 4.1

Find the matching parts between the shapesAB = _______

<D = _______

QP = _______

<M = _______

XM

<P

DE

<B

Section 4.1

What we can determine from a congruence statement?Example:

Triangle ABC = Triangle HFGWhich Angles are congruent? Which Sides are congruent?

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What we can determine from a congruence statement.Triangle GKD = Triangle LSP

Which angles are congruent?

Which sides are congruent?

Section 4.1

Are the shapes below congruent?

Yes, all of the matching sides and all of the matching angles are congruent.

Section 4.1

Are the shapes below congruent?

We can not determine if the shapes are congruent because we don’t have the necessary info about the sides and angles.

Section 4.1

Write a congruence statement, if possible

Section 4.1

Write a congruence statement, if possible.

Section 4.1

Write a congruence statement, if possible

Section 4.1

Homework

P 182 ( 3 – 35 odd)