Across
1
Rectangle with four equal sides
3
Split into equal parts
4
Line touching circle at one point
5
Rectangular array of numbers
7
Result of addition
8
Value that does not change
9
Round shape with all points equidistant
Down
2
Part of a whole number
3
Number with digits after a point
6
Repeated addition
10
Proven mathematical statement
11
Sum divided by count
12
Longest side of a right triangle