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Special Triangles

Problems

Isosceles Triangles

Equilateral Triangles

Problem : Decide whether or not the triangle below is isosceles.

Yes, it's isosceles.

Problem : Decide whether or not the triangle below is isosceles.

It is only isosceles if x = y . Otherwise, it is not isosceles.

Problem : Decide whether or not the triangle below is isosceles.

Yes, it's isosceles.

Problem : If the perimeter of a triangle is 15, and two of the side lengths are 3 and 8, can the triangle be isosceles?

No

Problem : Given: Triangle ABC is isosceles; angle A is 110 degrees; the length of side BC is 6; the length of side CA is 4. What is the perimeter of triangle ABC?

14

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