Posted by **derek** on Friday, May 30, 2008 at 5:37pm.

if the measures of the angles of a triangle are represented by 2x, 3x-15, and 7x-15, the triangle is

1)an isosceles triangle

2)a right triangle

3)an acute triangle

4)an equiangular triangle

- math -
**Damon**, Friday, May 30, 2008 at 5:56pm
The sides are different lengths so it is not isosceles or equiangular

(2x)^2 = 4x^2

(3x-15)^2 = 9x^2 -60x + 225

(7x-15)^2 = 49x^2 - etc

so a^2 +b^2 is NOT equal to c^2 so it is not a right triangle

Now lets see what x is:

2x + 3x +7x -30 = 180

12 x = 210

x = 17.5

so the three angles are:

2x = 35

3x-15 = 37.5

7x-15 = 107.5

so I would pick 3)

- math -
**drwls**, Friday, May 30, 2008 at 6:01pm
Add up the angles and set the sum equal to 180 (degrees). Then solve for x. Then see what the actual angles are and decide what kind of triangle it is.

Is "none of the above" an option?

- math -
**Damon**, Friday, May 30, 2008 at 6:22pm
hmm, now that you mention it, I would not pick any :)

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