Consider the following tiling. a. Is the tiling edge to edge? Explain....

Consider the following tiling.

a. Is the tiling edge to edge? Explain.

b. Under what condition would this tiling be called a regular tiling? Explain.

c. In the upper left-hand triangle, the vertex angle measures have been labeled. Copy the tiling and insert the measure of each of the vertex angles of the other triangles.

d. How can you use the tiling to explain why the sum of the angles in a triangle is 180°?