Transcript Document

What do we know
about angles?
Three types
Acute
Right
Obtuse
An acute angle’s measurement
is less than 90 degrees.
A right angle measures
exactly 90 degrees.
An obtuse angle’s measurement
is greater than 90 degrees
but less than 180 degrees.
What type of angle is this?
a) Acute
b) Obtuse
A right triangle has exactly
one right angle.
An acute triangle has three acute
angles.
Finally, an obtuse triangle has
one obtuse angle.
Finally, an equiangular
triangle has all angles of 60
degrees.
600
600
600
According to angles how would
you classify this triangle?
a)Acute Triangle
b)Right Triangle
A scalene triangle has no congruent sides.
Congruent means equal.
An isosceles triangle
has two congruent
sides.
An equilateral triangle has
all congruent sides and
angles.
You can classify this triangle two
ways which are they??
1. Scalene and Obtuse
2. Isosceles and Acute
3. Equilateral and Right
A triangle can be a right triangle
and a scalene triangle
True
False
Classifying Triangles by Their Angles
0
All angles will always be 60 .
600
Will always be an equilateral
triangle too.
600
600
60
All 3 angles measure less
than 90 degrees.
80
40
One angle measures 90
degrees and the other two
angles are acute.
One angle that measures
more than 90 degrees and
the other two are acute.
30
20
130
Classifying Triangles by Their Sides
3 congruent sides
All0 angles will always equal
60 .
2 congruent sides
Angles that are not formed by
the equal sides are also equal
No congruent sides
No equal angles
Now you know the basics
of angles and how to
classify triangles!