McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
2. Congruent Triangles
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Exercise 2 Page 347

When two angles have the same number of markers, this indicates that the angles are congruent. Similarly, when two sides have the same number of markers, the sides are congruent.

Corresponding Angles: ∠ A ≅ ∠ E, ∠ B ≅ ∠ F, ∠ C ≅ ∠ G, ∠ D ≅ ∠ H,
Corresponding Sides:AB ≅ EF, BC ≅ FG, CD ≅ GH, DA ≅ HE
Congruence Relation: ABCD ≅ EFGH

Practice makes perfect

To show that the polygons are congruent, we have to check for congruent angles and congruent sides.

Checking Angles

Let's first check the angles.

The markers on the angles tell us about the congruence relationships between the angles.

∠ A &≅ ∠ E ∠ B &≅ ∠ F ∠ C &≅ ∠ G ∠ D &≅ ∠ H All angles in ABCD have congruent pairs in EFGH.

Checking Sides

Now let's check the sides.

The markers on the sides tell us about the congruence relationships between the sides. AB &≅ EF BC &≅ FG CD &≅ GH DA &≅ HE All sides of ABCD have congruent pairs in EFGH.

Conclusion

Since the vertices of the two polygons can be paired up so that the corresponding angles and sides are congruent, the two polygons are congruent. AB C D ≅ EF G H