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The third angle must be 63 degrees because all angles in any triangle add up to 180 degrees

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Use the fact that the sum of the angles in a triangle is 180°.

Q: If the measures of two angles of an isosceles triangle are 54degrees and 63degrees what is the measure of the third angle?

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90Â° . That's true of any triangle. Doesn't have to be isosceles.

yes

An isosceles right angled triangle

An isosceles triangle

If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.

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It is an obtuse angled isosceles triangle.It is an obtuse angled isosceles triangle.It is an obtuse angled isosceles triangle.It is an obtuse angled isosceles triangle.

90Â° . That's true of any triangle. Doesn't have to be isosceles.

An isosceles triangle.

It is possible if neither of the angles in the triangle measures to 60 degrees

they would be congruent triangles!

An isosceles right angled triangle

yes

An isosceles triangle

A 45-45-90degree triangle is classified as an isosceles triangle.

If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.

45 degrees.

It would depend how long it is.