Triangles g7
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This document defines and describes different types of triangles based on side lengths and angle measures. It explains that a triangle is a three-sided closed shape, and triangles can be named as equilateral, isosceles, or scalene based on equal or unequal side lengths, or as acute, right, or obtuse based on angle measures less than, equal to, or greater than 90 degrees.
Triangles g7
- 3. Triangle: • A closed, three straight-sided shape is called a triangle.
- 4. Naming triangles • Triangles are named according to the lengths of their sides, or the size of their angles.
- 5. Naming triangles according to the lengths of their sides • Equilateral triangle: All three sides are equal in length. (Also all three angles are equal in size.)
- 6. Naming triangles according to the lengths of their sides • Isosceles triangle: Two sides are equal in length. (Also two angles at the base are equal in size.)
- 7. Naming triangles according to the lengths of their sides • Scalene triangle: No sides are equal in length. (Also no angles are equal in size.)
- 8. Naming triangles according to the size of their angles • Acute triangle: All angles less than 90°.
- 9. Naming triangles according to the size of their angles • Right triangle: Contains a right angle (90°).
- 10. Naming triangles according to the size of their angles • Obtuse triangle: Contains an obtuse angle (greater than 90°).