Pre-Algebra Mrs. Spanier

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Presentation transcript:

Pre-Algebra Mrs. Spanier Triangles Pre-Algebra Mrs. Spanier Bring your textbook today!

What is a triangle? It is a 2-dimensional closed polygon with exactly 3 sides and 3 angles.

How do you classify triangles? Fill in at least 2 definitions on your GO that you already know. Now give one, get one. Look at pp.234-235 to check your answers. Don’t forget to draw pictures!

Classify these triangles by SIDES. a) b) c) d) e)

Classify these triangles by ANGLES. a) b) c) d) e)

Angles of a Triangle Read Example 1 on p.234. Whisper the sum of any triangle’s angles to the person across from you. So… a + b + c = 180 If you are given 50 and 91, what is the measure of the third angle? Now try the 4 problems on the 5-3 WS.