MHB Is this triangle an isosceles triangle?

  • Thread starter Thread starter mathdad
  • Start date Start date
  • Tags Tags
    Triangle
mathdad
Messages
1,280
Reaction score
0
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?
 
Mathematics news on Phys.org
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.
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
Fermat's Last Theorem has long been one of the most famous mathematical problems, and is now one of the most famous theorems. It simply states that the equation $$ a^n+b^n=c^n $$ has no solutions with positive integers if ##n>2.## It was named after Pierre de Fermat (1607-1665). The problem itself stems from the book Arithmetica by Diophantus of Alexandria. It gained popularity because Fermat noted in his copy "Cubum autem in duos cubos, aut quadratoquadratum in duos quadratoquadratos, et...
I'm interested to know whether the equation $$1 = 2 - \frac{1}{2 - \frac{1}{2 - \cdots}}$$ is true or not. It can be shown easily that if the continued fraction converges, it cannot converge to anything else than 1. It seems that if the continued fraction converges, the convergence is very slow. The apparent slowness of the convergence makes it difficult to estimate the presence of true convergence numerically. At the moment I don't know whether this converges or not.

Similar threads

Back
Top