Classify triangles

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Learn it By sides: equilateral (3 equal), isosceles (2 equal), scalene (none equal). By angles: acute (all < 90°), right (one = 90°), obtuse (one > 90°). The angles add to 180°.

Example: A triangle has angles 35° and 47°. Find the third angle and classify it.

$180 - 35 - 47 = 98°$.
98° is greater than 90°.
It is an obtuse triangle.

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