Question

A right isosceles triangle has an angle with a measure of 45 degrees. If X represents the measure of third angle of the triangle, what is x. A.30 B.45 C.100 D.135

Answer 1

if a triangle has 180 degrees total with a right and of 90 and another of 45, then you would have 'B' with 45

Answer 2

As per the problem we have

A right isosceles triangle has an angle with a measure of 45 degrees.

As the triangle is right isosceles, it mean one of the angle will be 90 degree and the rest of the two angles will be equal.

As we know the sum of the angles of a Triangle is always 180 degrees.

Hence the third angle of the Right isosceles triangle will be 45 degrees.

Hence the correct option is B.