Across
1
Proven mathematical statement
5
Rectangle with four equal sides
6
Corner point of a polygon
7
Parts per hundred
8
Reference line in a graph
10
Comparison of two quantities
13
Round shape with all points equidistant
Down
2
U-shaped curve of a quadratic function
3
Split into equal parts
4
Longest side of a right triangle
5
Steepness of a line
7
Number divisible only by 1 and itself
9
Part of a whole number
11
Rectangular array of numbers
12
The number representing nothing