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Classify triangles
By angles
Acute triangle
has three acute angles
Right triangle
has one right angle
two acute angles
Obtuse triangle
has one obtuse angle
two acute angles
Equiangular triangle
Has all 3 angles congruent
By sides
Scalene triangle
has no sides congruent
Isosceles triangle
has 2 sides congruent
Equilateral triangle
has all 3 sides congruent
Draw acute scalene triangle
Draw acute isosceles triangle
Draw an acute equilateral triangle
Draw a right isosceles triangle
Draw a right equilateral triangle
• Not possible
Draw an obtuse scalene triangle
Draw an obtuse isosceles triangle
Draw an obtuse equilateral triangle
• Not possible
Draw an equiangular equilateral
triangle
Draw an equiangular scalene
triangle
• Not possible
Draw an equiangular isosceles
triangle
• Not possible
Scalene
Isosceles
equilateral
Acute
Right
NP
Obtuse
NP
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