With a good ol' fashion pen.
Impossible
There are 3 triangles in a pentagon
you can't
By cutting off two of its corners which will leave you with 2 triangles and 1 pentagon.
The answer depends on the shapes and sizes of the triangles. I can make a big triangle, a quadrilateral, pentagon, hexagon, etc up to 12 sides.
Select any vertex and draw 2 lines to the two opposite vertices.
There are 3 triangles in a pentagon
You can make any triangle, quadrilateral or pentagon with three suitable triangles.
you can't
By cutting off two of its corners which will leave you with 2 triangles and 1 pentagon.
pentagon i think?
The answer depends on the shapes and sizes of the triangles. I can make a big triangle, a quadrilateral, pentagon, hexagon, etc up to 12 sides.
Select any vertex and draw 2 lines to the two opposite vertices.
Oh, dude, there are technically 35 triangles in a pentagon. You've got the main five triangles from the pentagon itself, then you can make 10 more by connecting each vertex to the other non-adjacent vertices, and finally, you can make 20 more by connecting each vertex to the midpoint of the opposite side. So, yeah, 35 triangles in total, if you're into that kind of thing.
There are 3 triangles in a pentagon.
Draw a line from the midpoint of each side of the triangle to opposite corner. All three lines should intersect at the center of the original triangle and six smaller triangles will be formed. There are likely other solutions, but this is the easiest one.
Simply assemble the triangles in to a rectangle.
draw a big triangle then make a line halfway through it