Across
1
Proven mathematical statement
3
Closed shape with straight sides
6
Split into equal parts
9
Result of addition
10
System of ordered marks for measuring
11
Math using letters for unknown values
Down
2
Space between two intersecting lines
3
Number divisible only by 1 and itself
4
Lines that never intersect
5
Mathematical rule or equation
7
Sum divided by count
8
Repeated addition
12
U-shaped curve of a quadratic function