# Triangles

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 Author: Gengold ID: 54607 Filename: Triangles Updated: 2010-12-09 13:17:37 Tags: GRE Triangles Folders: Description: Triangles Show Answers:

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1. Isosceles Triangle

• - Two sides are the same length
• - The two angles facing those sides are the same length
2. Equilateral Triangle

• - All interior angles are 60
• - All sides are the same length.
3. Right Triangle

• - Contain a 90o angle
• - Puthagorean Theorem a2 + b2 = c2
4. 3-4-5 Right Triangle
sides always come in predictable ratios.

• 32 + 42 = c2
• 9 + 16 = c2
• 25 = c2
• 5 = c

• 122 + b2 = 132
• 144 + b2 = 169
• b2 = 25
• b = 5
5. Isosceles Right Triangle
• Ratio: 1 : 1 : √2
• Perimeter = 2x + x√2

• √2 = 1.4
6. 30-60-90 Right Triangle
• Ratio: 1 : √3 : 2
• Perimeter= x + 2x + x√3

√3 = 1.7

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