This document discusses the properties of triangles and three-sided polygons. It notes that a triangle has three vertices and three interior angles that sum to 180 degrees, while the three exterior angles sum to 360 degrees. It then defines a right triangle as having one 90 degree angle and identifies the base, height, and hypotenuse. The document also states that all angles in a triangle are less than 90 degrees, except for one angle in an obtuse triangle which is greater than 90 degrees.

3. C
z
x y
A B

4. •Three sided closed polygon.
•It has 3 vertex.
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•Sum of interior angle is 180 .
0
•Sum of exterior angle is 360 .

8. Right angled Triangle
It has a base.
It has a perpendicular length Height.
It has a hypotenuse.
one angle is 90 . 0

10. All angles are less than 90.0

12. One angle is greater than
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90.