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Classify Triangles by Sides and Angles
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Grade Level
Grade 5
5.130 Classify Triangles by Sides and Angles
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Triangle ERT has side lengths 18 cm, 18 cm, and 18 cm. It is rotated 180 degrees. What is the classification after the rotation?
A
Isosceles and acute: this classification would require exactly two equal sides and all angles less than 90 degrees
B
Equilateral and acute: rotation keeps all three equal side lengths and all 60-degree angles.
C
Scalene and acute: this classification would require three different side lengths and all angles less than 90 degrees
D
Equilateral and obtuse: this classification would require three equal sides and one angle greater than 90 degrees
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