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```SPI 6.4.2 I CAN identify and find
missing angles measures in triangles.
Classify Triangles
Sides
Angles
Equilateral
Acute
Isosceles
Obtuse
Scalene
Right
ALL three sides and angles equal in
measure. In the figure below , the slash
marks indicate equal measure.
At least 2 sides/angles have equal
measure. In the figure below , the slash marks
indicate equal measure.
62
62
All three sides of different measures (no equal
sides).
contains a right angle (90 ͦ)
Contains at least 1 obtuse angle
(greater than 90° but less than 180°)
123
All acute angles (less than 90°)
The sum of the measures of the angles of any
triangle always equals 180 degrees.
A + B + C = 180°
The top line (that touches the top of the triangle) is
running parallel to the base of the triangle. A
straight line or angle equals 180 degrees.
A + B + C = 180°
The measure of two angles are 45° and 45 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The measure of two angles are 15 ° and 47 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The measures of two angles are 53 ° and 76 ° .
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The measure of one angle is 18 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The measure of one angle is 90 degrees.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The measure of one angle is 115 degrees.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
The sides measures of a triangle is 10 cm, 5 cm,
and 10 cm. Classify this triangle?
A.
B.
C.
D.
Scalene
Acute
Isosceles
Obtuse
```
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