Add up all the sides Perimeter of Area of a Rectangle: ANY polygon:

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Presentation transcript:

Add up all the sides Perimeter of Area of a Rectangle: ANY polygon: Area of a Triangle: Add up all the sides

At least two sides are congruent All sides are different lengths Triangles Triangles can be classified according to its ___________ or _____________ Classify by Sides: NOTE! Sides Angles Use tick marks to show congruent sides EQUILATERAL ISOSCELES SCALENE All three sides are congruent At least two sides are congruent All sides are different lengths

All three angles are acute One angle is obtuse Classify by Angles: The sum of the angle measures in a triangle: ACUTE TRIANGLE OBTUSE TRIANGLE RIGHT TRIANGLE EQUIANGULAR TRIANGLE All three angles are acute One angle is obtuse One angle is a right angle All three angles have the same measure