Download Notes # (6-6) Triangles A is formed when three noncollinear points

Notes #
(6-6) Triangles
A
segments.
Point A is a
Points A, B, C are
is formed when three noncollinear points are joined by
.
.
The sum of the angle measure of any triangle is
Proof:
We can classify triangles by their
.
.
Acute Triangle
Obtuse Triangle
Right Triangle
3 acute angles
1 obtuse angle
1 right angle
We can classify triangles by their
Scalene Triangle
No two sides congruent
.
Isosceles Triangle
At least two sides congruent
1) Name the triangle according
to its sides.
Equilateral Triangle
All sides congruent
2) Name the triangle according
to its angles.
In an isosceles triangle, the angles opposite congruent sides are
.
Without a protractor, find the measure of each unknown angle.
3)
4)
Now, classify each triangle by its angles, then by its sides.
Find the values of x and y in the diagram.
5)
A ray that divides an angle into two congruent angles is said to
the angle. The ray is called the
.
6) In an isosceles triangle ABC, m B = m C = 70˚. The bisector of
meets side BC at point D. Find the measure of DAC.
A