Course:MATH230/Archive/2010-2011/101/groups/group03

= Group 3 =Sample Scratch

Geometry

Circles:

[1]

Area = πr²

Circumference = π(2r)

Properties of a circle:

- No visible straight lines in the circumference. - Length of lines going from one end of the circle to the other and passing through the center well all be the same length (diameter) - No specific start or end point. - π = 3.14159...

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Triangles:

Types of Triangles and Their Properties:

1) Equilateral Triangle - All three sides are the same length and all three angles in the triangle are 60 degrees.

2) Isosceles Triangle - Two sides are equal and the two angles that form at the bottom of each of the equal sides are the same.

3) Scalene Triangle - All three sides are different lengths and all three angles are different degrees.

4) Right Angle Triangle - Must have a right angle in it. Other properties vary.

General Properties of a Triangle and Formulas Related to Them:

- All angles in a triangle much equal 180 degrees.

- In a right angle triangle SOH-CAH-TOA can be used to find out unknown information:

- SOH-CAH-TOA Formulas:

1) SOH --> Sine=Opposite ÷ Hypotenuse

2) CAH --> Cosine= Adjacent ÷ Hypotenuse

3) TOA --> Tangent= Opposite ÷ Adjacent

- Pythagorus' Theorum --> A² + B² = C²