EXAMPLE 1 Use the Converse of the Hinge Theorem

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Presentation transcript:

EXAMPLE 1 Use the Converse of the Hinge Theorem Given that ST PR , how does PST compare to SPR? SOLUTION You are given that ST PR and you know that PS PS by the Reflexive Property. Because 24 inches > 23 inches, PT >RS. So, two sides of STP are congruent to two sides of PRS and the third side in STP is longer. By the Converse of the Hinge Theorem, m PST > m SPR. ANSWER

Solve a multi-step problem EXAMPLE 2 Solve a multi-step problem BIKING Two groups of bikers leave the same camp heading in opposite directions. Each group goes 2 miles, then changes direction and goes 1.2 miles. Group A starts due east and then turns 45 toward north as shown. Group B starts due west and then turns 30 toward south. o Which group is farther from camp? Explain your reasoning.

Solve a multi-step problem EXAMPLE 2 Solve a multi-step problem SOLUTION Draw a diagram and mark the given measures. The distances biked and the distances back to camp form two triangles, with congruent 2 mile sides and congruent 1.2 mile sides. Add the third sides of the triangles to your diagram. Next use linear pairs to find and mark the included angles of 150 and 135 . o Because 150 > 135 , Group B is farther from camp by the Hinge Theorem. o ANSWER

GUIDED PRACTICE for Examples 1 and 2 Use the diagram at the right. 1. If PR = PS and m QPR > m QPS, which is longer, SQ or RQ ? SOLUTION PR = PS and m QPR > m QPS, then PQ PQ by Reflexive Property. You are given that ANSWER RQ

GUIDED PRACTICE for Examples 1 and 2 Use the diagram at the right. 2. If PR = PS and RQ < SQ, which is larger, RPQ or SPQ? SOLUTION You are given that PR = PS and you know that PQ PQ by the Reflexive Property because RQ < SQ. So 2 sides of PSQ are congruent to 2 sides of PRQ and the third side in SPQ is longer. ANSWER SPQ

GUIDED PRACTICE for Examples 1 and 2 3. WHAT IF? In Example 2, suppose Group C leaves camp and goes 2 miles due north. Then they turn 40 toward east and continue 1.2 miles. Compare the distances from camp for all three groups. o ANSWER Group B is the farthest from camp, followed by Group C, and then Group A which is the closest.