area_and_perimeter.ppt |
Triangles A triangle has three sides and three angles The three angles always add to 180°Equilateral, Isosceles and Scalene There are three special names given to triangles that tell how many sides (or angles) are equal. There can be 3, 2 or no equal sides/angles: Equilateral TriangleThree equal sides Three equal angles, always 60° Isosceles TriangleTwo equal sides Two equal angles Scalene TriangleNo equal sides No equal angles What Type of Angle? Triangles can also have names that tell you what type of angle is inside: Acute TriangleAll angles are less than 90° Right TriangleHas a right angle (90°) Obtuse TriangleHas an angle more than 90° |
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January 2014
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