Triangles - Grade School

1. TRIANGLES

2. POLYGON
- A closed plane figure
made up of line
segments.

3. TRIANGLE
● It is a polygon with three sides
and three angles and with a
total interior angle measure of
180°.
● It can be classified according to
sides or angles.

4. TRIANGLES
ACCORDING TO
SIDES

5. EQUILATERAL TRIANGLE
● Its sides are all congruent.

6. ISOSCELES TRIANGLE
● Two of its sides are congruent.
These sides are called the legs.
The third side is called the
base.

7. SCALENE TRIANGLE
● The measurements of the side
of this triangle are different. No
sides of this triangle are
congruent.

8. TRIANGLES
ACCORDING TO
ANGLES

9. ACUTE TRIANGLE
● All of its angles are acute.

10. RIGHT TRIANGLE
● One of its interior angles
measures exactly 90°.

11. OBTUSE TRIANGLE
● One of its interior angles
measures more than 90° but
less than 180°.

12. EQUIANGULAR TRIANGLE
● All of its angles are congruent.
Each measures 60°.

14. Determine the missing angle.

15. Determine the missing angle.

16. Determine the missing angle.