I cant draw triangles with different sides lengths

Rhino Rhino for Mac
1

Hi I need to draw a triangle with different sides lenght but I dont know ho can some one please help me??

2

Any closed polyline with three sides will be a triangle. Use the polyline tool, click the start point, enter a length to limit the first side to what you want, click the second point, enter a length, then close… --Mitch

3

If you have tree side lengths, A, B & C, draw a line with A as length. Then at each end of the line draw a circle with B and C as the radius. Where the circles cross you have your solution. If the line was horizontal you have two triangles, one pointing up, another pointing down.

4

Thanks that was very helpful. My workmate also suggested that you only need to sides lengths and the angle between them and I used the computer angle generator. Just in case some has the same issues.