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+1 vote

Which of the triangles is an isosceles triangle having the three angles :

- $40^{\circ},50^{\circ},90^{\circ}$
- $30^{\circ},60^{\circ},90^{\circ}$
- $45^{\circ},45^{\circ},90^{\circ}$
- $35^{\circ},55^{\circ},90^{\circ}$

+2 votes

An Isosceles (isomeanssameandskelosmeanslegwhich tellssame leg)triangle is an triangle with two equal sides (as shown in the above image , where equal sides are marked by a & the remaining side are marked by b). And we know whentwo sidesareequal, two anglesare alsoequal. So, Isosceles Triangle has two equal sides with two equal angles.

∴ Among the above options only option C) is having two equal angles.

So, Answer will be **Option C). **

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