Across
1
Round shape with all points equidistant
5
Rectangular array of numbers
6
Proven mathematical statement
7
Rectangle with four equal sides
12
Mathematical statement of equality
13
U-shaped curve of a quadratic function
Down
2
Part of a whole number
3
Longest side of a right triangle
4
Math using letters for unknown values
7
System of ordered marks for measuring
8
Part of a circle's circumference
9
Symbol representing unknown value
10
Single numeral from 0 to 9
11
Steepness of a line