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Triangles

Triangles. by Deb Kiley Butch Fitzgerald Sandymount Elementary School February 2005. First, Know Your Angles. Acute – less than 90 degrees Right – exactly 90 degrees Obtuse – greater than 90 degrees Straight – exactly 180 degrees. Acute. Less than 90 degrees. vertex. Right.

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Triangles

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  1. Triangles by Deb Kiley Butch Fitzgerald Sandymount Elementary School February 2005

  2. First, Know Your Angles • Acute – less than 90 degrees • Right – exactly 90 degrees • Obtuse – greater than 90 degrees • Straight – exactly 180 degrees

  3. Acute • Less than 90 degrees vertex

  4. Right • Exactly 90 degrees vertex The intersection of the rays are perpendicular.

  5. Obtuse • Greater than 90 degrees vertex

  6. Straight • Exactly 180 degrees

  7. Triangles • 3 sided polygon • Identified by angles and sides • The sum of all angles equals 180 degrees

  8. Types of Triangles • By angles • Acute • Right • Obtuse • By sides • Equilateral • Isosceles • Scalene

  9. Acute Triangle • A third line segment connecting the two rays of an angle makes an acute triangle. Acute triangles have 3 acute angles.

  10. Right Triangle • A third line segment connecting the two rays of an angle makes a right triangle. Right triangles have 1 right angle and 2 acute angles.

  11. Obtuse Triangle • A third line segment connecting the two rays of an angle makes an obtuse triangle. Obtuse triangles have 1 obtuse angle and 2 acute angles.

  12. Equilateral Triangle • A third line segment connecting the two rays of an angle makes an equilateral triangle. Equilateral triangles have 3 congruent sides.

  13. Isosceles Triangle • A third line segment connecting the two rays of an angle makes an isosceles triangle. Isosceles triangles have only 2 congruent sides.

  14. Scalene Triangle • A third line segment connecting the two rays of an angle makes a scalene triangle. Scalene triangles have NO congruent sides.

  15. Straight Triangle ? BCR

  16. Triangle to Trapezoid • A trapezoid has only 1 set of parallel sides. It can be made by cutting a triangle in half. trapezoid

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