A
triangle is a shape with only 3 sides, or edges. Where two line
segments meet is called a vertex. The plane that is created by a
triangle is called a face. The bottom edge is called the base.
Let’s draw a triangle!
First, we start with a line, then we make a bend and draw another
line, then we make another bend and draw back to the starting line.
The next shape we will be exploring is the equilateral
triangle. An equilateral triangle has 3 equal sides, with interior
angles of 60 degrees on a plane.
The triangle – circle relationship has amazing
properties, first explored in by Pythagoras. Note how the radius
of each circle is exactly twice that of the next smallest circle,
and the height of each triangle is 2 times the preceding triangle
as well.
