Which characteristics best describe a right isosceles triangle? I. All angles are acute. II. All side lengths are equal. III. Two sides meet at a 90° angle. IV. Two sides are equal in length.

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IV. Two sides are equal in length. One way I remember this is in isosceles there are 2 e's and 1 l, an e is a side that is equal and the l is the other side. isosceles 


III. and IV. as you need two sides to meet at 90° for it to be a right isosceles triangle, and two sides always need to be equal for it to be an isosceles. Otherwise it's scalene.

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