Lesson 5-3 Triangles Obj: The student will be able to find unknown angles and identify possible side lengths in triangles HWK: p 208 1-8 all, 22-27 all.

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Presentation transcript:

Lesson 5-3 Triangles Obj: The student will be able to find unknown angles and identify possible side lengths in triangles HWK: p 208 1-8 all, 22-27 all Vocab: 1) Triangle Sum Theorem 2) acute triangle 3) right triangle 4) obtuse triangle 5) equilateral triangle 6) isosceles triangle 7) scalene triangle 8) Triangle Inequality Theorem

Find the measure of the missing angle Ex 1) Ex 2) 42° 63° x° y° 37°

Ex 3) Ex 4) w° 62° w° 5x° 3x° 2x°

Ex 5) The second angle in a triangle is six times as large as the first. The third angle is half as large as the second. Find the angle measures and draw a possible picture.

Triangle Inequality Theorem The sum of the lengths of any two sides of a triangle is greater than the length of the third side Sides of a triangle : 4, 5, 7 can it form a triangle? 2, 4, 8 can it form a triangle?

Tell whether a triangle can have sides with the given lengths. Explain Ex 6) 8 ft, 10 ft, 13 ft Ex 7) 2 m, 4 m, 6 m