Two polygons are congruent and the perimeter of the first polygon is 30 cm. If the sides of the second polygon are consecutive integers (x, x+1, x+2, x+3, etc.), what value of x makes the polygons into congruent triangles? Use x as the smallest side.

( I got 6 but thats obviously wrong seeing I can only choose from 9, 10, 11, or 12)

Question

Two polygons are congruent and the perimeter of the first polygon is 30 cm. If the sides of the second polygon are consecutive integers (x, x+1, x+2, x+3, etc.), what value of x makes the polygons into congruent triangles? Use x as the smallest side. 

( I got 6 but thats obviously wrong seeing I can only choose from 9, 10, 11, or 12)

anonymous · Answer

|dw:1341598816226:dw|
yo, gurl, what's the perimeter of that triangle? How do I calculate it?

anonymous · Answer

it doesn't say its a triangle it just says its a polygon and that its perimeter is 30cm what I wrote is all that is given :/

anonymous · Answer

I quote "what value of x makes the polygons into congruent triangles?"

anonymous · Answer

It's a weird way to state the problem, but the polygons are triangles.

anonymous · Answer

I see what you're saying now, ugh I have no idea I'm totally confused on this one I have no idea to work it out becuase what I did was 4x+6=30 and got 6 but I don't have 6 to chose from.

anonymous · Answer

Okay, that would be correct if it was a quadrilateral, but it states that it's a triangle.

anonymous · Answer

so how do you do it then?

anonymous · Answer

Again, here's the triangle
|dw:1341599480153:dw|
How do you calculate the perimeter of that triangle?