McGraw Hill Integrated II, 2012
MH
McGraw Hill Integrated II, 2012 View details
3. Inequalities in One Triangle
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Exercise 5 Page 430

Consider Theorem 5.9 about Angle-Side Relationships in Triangles.

Angles: ∠ A, ∠ C, ∠ B
Sides: BC, AB, AC

Practice makes perfect

To find the order of the angle measures and sides from smallest to largest, let's look at the given diagram and notice the marked lengths of the sides.

We can see that BC is the shortest side, followed by AB and then AC.

BC< AB< AC ⇕ 1.7 < 2.8 < 3.1 Next, let's consider Theorem 5.9 about Angle-Side Relationships in Triangles.

Angle-Side Relationships in Triangles

If one side of a triangle is longer than another side, then the angle opposite the longer side has greater measure than the angle opposite the shorter side.

Now we need to think about the sides, and the corresponding opposite angles. cc Side & Opposite Angle [0.5em] BC & ∠ A [0.5em] AB & ∠ C [0.5em] AC & ∠ B Therefore, we can list the angles in order from smallest to largest. m∠ A < m∠ C < m∠ B