Across
1
Number greater than zero
6
Rectangle with four equal sides
7
Amount of space an object occupies
8
Result of multiplication
9
Split into equal parts
11
U-shaped curve of a quadratic function
12
Symbol representing unknown value
Down
2
System of ordered marks for measuring
3
Math using letters for unknown values
4
Three-sided polygon
5
The number representing nothing
6
Result of addition
10
Number that divides evenly into another
13
Longest side of a right triangle