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

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)?

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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