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Classification of Triangles

Can a scalene triangle be obtuse? Is an equilateral triangle always acute?

Classification of Triangles Warmup


True or False?

A right triangle can be isosceles.

Above, a line cuts across two adjacent rectangles.

How many right triangles can you find in this diagram?

Two sides of an isosceles triangle measure 3 and 5. What could be the length of the third side?

Eli needs to draw an obtuse triangle and begins by creating a \(40^\circ\) angle. What could be the measure of the next angle he draws? (In an obtuse triangle, one angle measures more than \(90^\circ.\)

What type of triangle has both an \(89^\circ\) angle and a \(1^\circ\) angle?


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