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Classification of Triangles

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

Level 1

         

Arjit drew an isosceles right angled triangle on the board. What is the measure of the base angle?

The polygonal path connecting points A and B forms 7 equilateral triangles.

If the distance between point A to point B is 20 units, then how long is the distance of the path (in units)?

Let \(\triangle ABC\) and \(\triangle CDE\) be equilateral triangles of the same size, and \(\angle BCD=80^\circ\) between them. Find the measure of \(\angle BAD\) in degrees.

Which non-degenerate triangle cannot have one of its angles as \({91}^\circ\)?

Which non-degenerate triangle can have one of its angles as \({89}^{\circ}\)?

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