Across
1
Closed shape with straight sides
4
Split into equal parts
5
Comparison of two quantities
7
Part of a line with two endpoints
8
Sum divided by count
9
Part of a whole number
11
Line crossing from corner to corner
Down
1
U-shaped curve of a quadratic function
2
The number representing nothing
3
Mathematical rule or equation
6
Three-sided polygon
10
Line touching circle at one point
12
Rectangle with four equal sides