Across
- 7. a polygon with three sides and three angles.
- 9. a way of representing numbers using parts of a whole.
- 11. a mathematical sentence that shows two expressions are equal.
- 12. the branch of mathematics that studies shapes and their properties.
Down
- 1. a symbol used to represent a number that can change.
- 2. a mathematical operation used to find the total of two or more numbers.
- 3. a tool used to measure angles.
- 4. a mathematical operation that shows the difference between two numbers.
- 5. a closed plane figure made of straight sides.
- 6. the distance around a shape.
- 8. a plane figure where all points are the same distance from the center.
- 10. a three-dimensional shape with six equal square faces.