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basic & secondary parts of triangles.ppt
1. quiz
1-3. What are angles as
classified according to
the number of congruent
sides.
4-6. What are angles as
classified according to
the measures of their
angles.
7-10. What are the
secondary parts of a
triangle.
14. SECONDARY PARTS OF A TRIANGLE
ANGLE BISECTOR
- Is a segment that
DIVIDES (bisects)
any angle of a
triangle into 2
angles of equal
measures.
M N
G S
B
A
AG, BN & SM are angle bisector of BAS.
20°20°
40°
40°
30°
30°
41. CLASSIFICATION of triangles
ACCORDING TO
THE NUMBER OF
CONGRUENT
SIDES
SCALENE
TRIANGLE
ISOSCELES
TRIANGLE
EQUILATERAL
TRIANGLE
ACCORDING TO
THEIR ANGLES
ACUTE TRIANGLE
RIGHT TRIANGLE
OBTUSE
TRIANGLE
EQUIANGULAR
TRIANGLE
42. True or false
1. An isosceles triangle can be an equilateral triangle.
2. An equilateral triangle can be an isosceles triangle.
3. A triangle can have two right angles.
4. An scalene triangle can be an equilateral triangle.
5. All angles of an equilateral triangle are acute.
6. All angles of an scalene triangle are acute.
7. The longest side of a right triangle is called the
vertex.
8. Base angles of an isosceles triangle are always
acute.
9. An equiangular triangle is also an equilateral
triangle.
10. An scalene triangle can be a right triangle.
44. True or false
1. A triangle can be isosceles and acute.
2. A triangle can have two obtuse angles.
3. A triangle can be obtuse and scalene.
4. An scalene triangle can be an equilateral
triangle.
5. A triangle can be right triangle and isosceles.
6. A triangle can have two right angles.
7. A triangle can have at most three acute angles.
8. A triangle can have at least one(1) acute angles.
9. An equilateral triangle is also an acute triangle.
10. An equiangular triangle can never be a right
triangle.