An isosceles triangle has a base and two equal sides.
The two equal sides whan added together must exceed the length of the base.
So if the base is 10 units the two equal sides must be above 5 units each.
Examples are: 10, 6, 6 or 5, 7, 7, or 2, 4, 4 .... etc
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The base could be infinitely long or infinitely short, and the sides could also be infinitely long or short, provided that the figure was still a triangle. Therefore there are, in theory, an infinite number of measures for both the base and the sides.
The angles of a triangle, however, must always add up to 180 degrees.
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90° . That's true of any triangle. Doesn't have to be isosceles.
An isosceles triangle
yes
An isosceles right angled triangle
There are infiitely many possible answers. A right angled isosceles triangle is one.There are infiitely many possible answers. A right angled isosceles triangle is one.There are infiitely many possible answers. A right angled isosceles triangle is one.There are infiitely many possible answers. A right angled isosceles triangle is one.