We can classify triangles by sides or angles.
Begin by finding the area of a triangle.
Side lengths
Equilateral all sides are the same length.
Isosceles. two sides are the same length.
Scalene: no sides are the same length.
Angles
Acute triangle: has all angles less than 90 deg.
Right triangle: has one 90 deg angle.
Obtuse triangle: has an angle greater than 90 deg.
Try Activity One
After you finished the matching watch this video on triangles.
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