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

Isosceles triangle
Scalene triangle
All of these
Right angled triangle

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An isosceles triangle can have its angles as $91,44.5,44.5$

A scalene triangle can have its angles as $91,10, 79$

A right angled triangle cannot have one of its angles as ${91}^°$ because one of its remaing angles would be ${90}^°$ , and $90 + 91 = 181 > 180$ .

So, the answer is $\color{#3D99F6}{\boxed{\text{Right angled triangle}}}$ .