Angles in a_triangle
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Transcript of Angles in a_triangle
![Page 1: Angles in a_triangle](https://reader036.fdocuments.in/reader036/viewer/2022062406/558beb69d8b42ac0158b4645/html5/thumbnails/1.jpg)
Reading AnglesReading Angles
When reading angles the middle letter is When reading angles the middle letter is always the vertex.always the vertex.
A B
C
GH D
F
E
I
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Angles in a TriangleAngles in a Triangle
L.I. We are learning that interior L.I. We are learning that interior angles of a triangle will always angles of a triangle will always
add to 180 add to 180 °°
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DefinitionDefinitionAngle Angle – two rays that meet at – two rays that meet at
a common end point.a common end point.
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DefinitionDefinitionDegree Degree – a unit of – a unit of
measurement of an angle or measurement of an angle or arc, represented by the arc, represented by the symbol º.symbol º.
30º
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DefinitionDefinition
Complementary Angles are angles Complementary Angles are angles that when added together make a that when added together make a right angle, 90.. right angle, 90..
A + B = 90.A
B
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DefinitionDefinition
Supplementary Angles are angles Supplementary Angles are angles that when added together are equal that when added together are equal to 180˚.to 180˚.
A + B = 180.A
B
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DefinitionDefinitionTriangleTriangle – a polygon with 3 – a polygon with 3
angles and 3 straight sides.angles and 3 straight sides.
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Property of trianglesProperty of trianglesThe sum of all the angles The sum of all the angles
equals 180º degreesequals 180º degrees..
90º 30º
60º
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Property of trianglesProperty of trianglesThe sum of all the angles The sum of all the angles
equals 180º degreesequals 180º degrees..
90º 30º
60º
60º90º30º+180º
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Property of trianglesProperty of trianglesThe sum of all the angles The sum of all the angles
equals 180º degreesequals 180º degrees..
90º 50º
40º
40º90º50º+180º
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Property of trianglesProperty of trianglesThe sum of all the angles The sum of all the angles
equals 180º degreesequals 180º degrees..60º60º60º+180º60º 60º
60º
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What is the missing What is the missing angle?angle?
70º70º?+
180º70º 70º
?
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What is the missing What is the missing angle?angle?
90º30º?+
180º30º 90º
?
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What is the missing What is the missing angle?angle?
60º60º?+
180º60º 60º?
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What is the missing What is the missing angle?angle?
30º78º?+
180º78º 30º
?
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What is the missing What is the missing angle?angle?
40º40º?+
180º40º 40º
?