spi 6.4.2 i can identify and find missing angles measures in triangles
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TRIANGLESSPI 6.4.2 I CAN identify and find
missing angles measures in triangles.
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A triangle is a closed figure with three line segments and three angles.
Classify TrianglesSides AnglesEquilateral Acute
Isosceles Obtuse
Scalene Right
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Equilateral Triangle
ALL three sides and angles equal in measure. In the figure below , the slash marks indicate equal measure.
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Isosceles Triangle
At least 2 sides/angles have equal measure. In the figure below , the slash marks indicate equal measure.
62 62
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Scalene Triangle
All three sides of different measures (no equal sides).
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Right Triangle
contains a right angle (90 ͦ)
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Obtuse Triangle
Contains at least 1 obtuse angle (greater than 90° but less than 180°)
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Acute Triangle
All acute angles (less than 90°)
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The sum of the measures of the angles of any triangle always equals 180 degrees.
A + B + C = 180°
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This is a proof that the angles in a triangle equal 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°
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Find the missing angle c?
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Question 1
The measure of two angles are 45° and 45 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 2
The measure of two angles are 15 ° and 47 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 3
The measures of two angles are 53 ° and 76 ° .
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 4
The measure of one angle is 18 °.
A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 5
The measure of one angle is 90 degrees.A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 6
The measure of one angle is 115 degrees. A. Acute
B. Right
C. Obtuse
D. Cannot be determined
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Question 7
The sides measures of a triangle is 10 cm, 5 cm, and 10 cm. Classify this triangle?
A. Scalene
B. Acute
C. Isosceles
D. Obtuse
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Find the missing angle c?
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Find the missing angle c?
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Find the missing angle b?
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