Because there are 540 interior degrees in a five sided figure and the total sum of three triangles is 540 degrees
They are called polygons
In general, a parallelogram. But if the triangles are joined along their odd side, a rhombus.
a geometric shape made up of 20 triangles. :)
A triangle that can be made in more than one way
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.
Yes
yes
Yes
Yes because there are 540 degrees in a pentagon and 180 degrees in a triangle so 540/180 = 3 triangles.
Yes. You can always draw a "diagonal" line between opposite corners of any four-sided figure. Then, cutting along that line, you wind up with two triangles out of which the figure could have been made.
Yes because 3*180 are the interior degrees of a pentagon.
You can always find opposite corners that can be connected with a line which divides the quadrilateral into two trilaterals.
A 16 sided polygon is made from 14 triangles
It is a three dimensional figure of some sort.
A dodecagon is a 12 sided shape made from 10 triangles
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
Because all other polygons are made from triangles as for example an 8 sided octagon has 6 triangles within it or a 6 sided hexagon has 4 triangles within it.