Across
1
Number divisible only by 1 and itself
3
Comparison of two quantities
4
Number with digits after a point
7
Amount of space an object occupies
8
U-shaped curve of a quadratic function
9
Space between two intersecting lines
11
Proven mathematical statement
Down
2
Three-sided polygon
5
Steepness of a line
6
Part of a line with two endpoints
10
Rectangle with four equal sides
12
Single numeral from 0 to 9