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McGraw Hill Glencoe Geometry, 2012

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McGraw Hill Glencoe Geometry, 2012 View details

6. Isosceles and Equilateral Triangles

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Exercise 11 Page 289

Consider the Isosceles Triangle Theorem.

∠ ACD ≅ ∠ ADC

Practice makes perfect

Before we begin, let's use the given information to mark the congruent sides of the given figure.

To name two congruent angles, we will use the Isosceles Triangle Theorem.

Isosceles Triangle Theorem
If two sides of a triangle are congruent, then the angles opposite those sides are congruent.

Using this theorem, let's show the congruent angles.

We can see that ∠ ACD is congruent to ∠ ADC. ∠ ACD ≅ ∠ ADC

Subchapter links

Check Your Understanding p.289

Practice and Problem Solving p.289-292

H.O.T. Problems p.292

Standardized Test Practice p.293

Spiral Review p.293

Skills Review p.293