An angle is the space between two lines that start at the same point. This point is called the vertex. Angles measure the size of a turn in degrees. You can show degrees using the symbol ° after ...

Look for arcs inside each vertex. The same number of arcs indicate equal angles. Different numbers of arcs indicate different angles. To identify the symmetry of a triangle: Count how many ways ...

The plural for vertex is vertices. The angle is this bit the space where two rays meet. This is usually represented by an arc and measured in degrees. There are 360 degrees in one full rotation.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. What is a quadrilateral? A quadrilateral is a four-sided shape where each of the sides are straight ...