Mathematics!

3. When two shapes or figures have the same size and shape
8. Expressions involving sums of powers of variables with coefficients.
10. Irrational roots expressed without a decimal or fraction.
12. The branch of mathematics dealing with data collection, analysis, and interpretation.
13. The space between two intersecting lines, measured in degrees.
15. The measure of space occupied by a 3D object.
17. The slope or rate of change in a line graph.
18. Numbers that determine a point's position on a grid
19. Branch of mathematics concerned with shapes, sizes, and the properties of space.
21. A mathematical statement that shows two expressions are equal.

1. Four-sided figure with opposite sides equal.
2. A closed figure with three or more straight sides.
4. A diamond-shaped quadrilateral.
5. A line segment connecting two points on a circle.
6. The mathematical constant that is the ratio of a circle's circumference to its diameter.
7. Numbers that denote repeated multiplication.
9. The non-negative value of a number.
11. The value that, when squared, gives the original number.
14. A comparison of two quantities.
16. A line that touches a curve at exactly one point.
20. The midpoint between two or more numbers.