hi,
i need to prove that the triangle with vertices (-2,8), (3,20) and (11,8) is isoceles. Find its area.
now for this question would i just need to draw it on a graph and dop;
BxH/2
13x12=156/2=78
if this is correct so far im unsure what to do after this point to find that it is isoceles.
help is required please!
thanks!
Hello, andyboy179!
Prove that the triangle with vertices A(-2,8), B(3,20) and C(11,8) is isoceles.
Find its area.
For this question, would i just need to draw it on a graph and do:
. . . . . . Yes!
If this is correct so far, I;m unsure what to do after this point to find that it is isoceles.
Excellent work!
We see that is horizontal and
And we find that the altitude from is 12.
An isosceles triangle has two equal sides.
Use the Distance Formula on side
. . You'll find that it too is 13 units long.
(We also find that is not 13 units long.
Hence, the triangle is not equilateral.)