5.1 Angles of Triangles with answers - Noble's Teaching Website
5.1 Angles of Triangles with answers
5.1 Angles of Triangles
1
5.1 Angles of Triangles with answers
Classifying Triangles
Classify the following triangles by their sides.
Equilateral triangle: all sides are congruent
Isosceles Triangle: two sides are congruent.
Scalene triangle: no two sides are congruent.
? An equal number of slashes on sides of a triangle indicate that those sides are congruent.
2
5.1 Angles of Triangles with answers
Classify the following triangles by their angles.
? All triangles have at least 2 acute angles. The third angle is used to classify the triangle.
50 Acute Triangle: 70
all angles are less
than 90 degrees.
10
120
Obtuse Triangle: one angle is more than 90.
50
60
Right Triangle:
one angle is 90
30
degrees
60
60
Equiangular
Triangle:
all angles are
equal measure.
60
60
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5.1 Angles of Triangles with answers
Triangle Sum Theorem:
The sum of the measure of the interior angles of a triangle is 180o.
Exterior Angle Theorem:
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.
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5.1 Angles of Triangles with answers
Isosceles Triangles
Equilateral Triangle
? Name the vertex angle and base angles:
? Solve for x and y:
5
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