I solved this question again to understand the concept better.

Method:

One side = 3

We just know that one side of this triangle is 3 and it can be any side.

1) Two sides are equal and thus any two sides of this triangle can be equal but which two sides ?

Not sufficient to conclude anything.

BCE

2) 2*pi*r= 3*pi

r= 1.5

Diameter= 3

We already one side of the triangle is 3 and according to second statement diameter is 3. As we know diameter is the longest side of the triangle and thus no other side will equal 3. We can conclude that it is a right angled triangle.

B

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