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30-60-90 triangles 5-27-09 IMP3 Sia. Today’s Agenda Bell Ringer Review 45-45-90 30-60-90 triangles Pythagorean Theorem worksheet due Friday, 5-29- 09.

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Presentation on theme: "30-60-90 triangles 5-27-09 IMP3 Sia. Today’s Agenda Bell Ringer Review 45-45-90 30-60-90 triangles Pythagorean Theorem worksheet due Friday, 5-29- 09."— Presentation transcript:

1 30-60-90 triangles 5-27-09 IMP3 Sia

2 Today’s Agenda Bell Ringer Review 45-45-90 30-60-90 triangles Pythagorean Theorem worksheet due Friday, 5-29- 09

3 Announcements HW Hall this Thursday during 9th period ACT session this Saturday in room 208 from 8am- 10am Turn in your calculators by the end of this week, or else you will get a debt slip from me next Monday.

4 45-45-90 A right isosceles (two sides congruent) triangle is a special type of triangle: the 45-45-90 triangle.

5 Another type of triangle… Another special right triangle is the 30-60-90 triangle.

6 Why? Memorizing the side lengths of these special triangles saves us TIME we would spend using the Pythagorean Theorem.

7 30-60-90 The side opposite the smallest angle is the smallest side. The HYPOTENUSE is DOUBLE the smallest side. The other leg is the smallest side times the square root of 3.

8 Examples 7 30º 60º 14 30º 24 60º 12

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