High school geometry can be a challenge! This Tic-Tac-Toe game provides a fun way to practice vocabulary. You'll need to use your understanding of circles in order to conquer squares and earn points in this activity. It's an excellent way to study for a test! Review the "Terms to Know" before and/or during the game for extra help.

*radius*: the distance from the center of a circle to its edge

*chord*: the distance from one edge of a circle to another

*diameter*: the longest chord of a circle, as it passes through a circle's center

*center*: the middle point of a circle

*tangent*: a line or line segment that touches a circle at exactly one point

*secant*: a line that intersects a circle twice

*circumference*: the distance around the outside of a circle

*minor arc*: the smaller of two arcs formed when a circle is divided into two unequal parts

*major arc*: the larger of two arcs formed when a circle is divided into two unequal parts

*semicircle*: exactly half of a circle

Learning circle terminology has never been easier with this fun game. The rules are very similar to Tic Tac Toe, a game that your child is probably knows very well. Best of all, once you're done playing, he'll have his circle words down pat.

### What You Need:

- Paper
- Marker
- Friend

### What You Do:

- Using the marker, help your child draw a grid 5 x 10 grid consisting of 50 squares on the paper (five squares wide, ten squares long).
- Have your child write each of different circle terms 5 different times in the grid.
- Then, write the definitions of the terms on a separate piece of paper.
- Have the players take turns quizzing one another. One player should read a definition, and the other must guess the circle term that corresponds to the definition.
- If a player identifies a circle term correctly, he gets to put an X or an O in one of the five squares containing the corresponding definition.
- The rules of the game are similar to Tic-Tac-Toe, but instead of getting three squares in a row, players must get 5 squares in a row.
- The child who goes first should pick a term from the list provided and match it to a definition.
- Play continues until one of the players has successfully filled in five squares in a row.

Helpful tip: You may want to laminate your grid and use dry or wet erase markers to make this board reusable.