body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Dashboard

Glencoe Math: Course 2, Volume 2 View details

3. Triangles

Continue to next subchapter

Exercise 16 Page 561

Markers on the sides of figures indicate that they are congruent.

Obtuse isosceles triangle

Practice makes perfect

We will classify the marked triangle in the building. Let's review how to classify triangles by their sides and angles.

Classification of Triangles
By Angle Measures		By Side Lengths
Acute Triangle	All angles are acute.	Scalene Triangle	All three sides have different lengths.
Right Triangle	One angle is a right angle.	Isosceles Triangle	Exactly two sides have the same length.
Obtuse Triangle	One angle is an obtuse angle.	Equilateral Triangle	All side lengths are congruent.
Equiangular Triangle	All angle measures are congruent.	Equilateral Triangle	All side lengths are congruent.

Now, let's take a look at the triangle part of the given figure!

The markers on the two sides of the triangle indicate that these sides are congruent. Since two sides are congruent, this is an isosceles triangle. One of the angles is obtuse, which means that it is an obtuse isosceles triangle.

Subchapter links

Guided Practice p.558

Independent Practice p.559-560

H.O.T. Problems p.560

Standardized Test Practice p.560-562

Extra Practice p.561

Common Core Review p.562

Exercise 16 Page 561

Hints

Check the answer

Practice exercises

Asses your skill