MHB Is this triangle an isosceles triangle?

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The discussion focuses on determining whether triangle ABC, with vertices A(0, 2), B(7, 4), and C(2, -5), is isosceles using the distance formula. The calculations reveal that sides AB and AC are equal in length, while side BC is different. This confirms that triangle ABC meets the criteria for being classified as an isosceles triangle. Additionally, it is noted that an equilateral triangle is a specific type of isosceles triangle. The conclusion is that triangle ABC is indeed isosceles.
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Use the distance formula to show that the triangle with the given vertices is an isosceles triangle.

A(0, 2), B(7, 4), C(2, -5)

I must use the distance formula to find AB, BC and AC.
Two sides or lengths must be equal and one side different to be an isosceles triangle.

Correct?
 
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Yes, the distance formula would be a good way to proceed, but recall, an equilateral triangle is a special case of an isosceles triangle...so, you could have all 3 sides equal in length and still call it an isosceles triangle...much like you can call a square a rectangle that just happens to have all 4 sides being equal in length.
 
MarkFL said:
Yes, the distance formula would be a good way to proceed, but recall, an equilateral triangle is a special case of an isosceles triangle...so, you could have all 3 sides equal in length and still call it an isosceles triangle...much like you can call a square a rectangle that just happens to have all 4 sides being equal in length.

I will show my work when time allows.
 
I will not answer this question using MathMagic Lite.

A(0, 2), B(7, 4), C(2, -5)

AB = sqrt{(7 - 0)^2 + (4 - 2)^2}

AB = sqrt{49 + 4}

AB = sqrt53}

BC = sqrt{(2 - 7)^2 + (-5 - 4)^2}

BC = sqrt{25 + 81}

BC = sqrt{106}

AC = sqrt{(2 - 0)^2 + (-5 - 2)^2}

AC = sqrt{4 + 49}

AC = sqrt{53}

Side AB = side AC.

BC is different than the other two sides of the triangle.

Therefore, triangle ABC is isosceles.
 
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