Across
1
Value that does not change
7
Three-sided polygon
8
Round shape with all points equidistant
10
Parts per hundred
11
Divisible by two
12
Sum divided by count
Down
2
Part of a whole number
3
Closed shape with straight sides
4
Exact correspondence on both sides
5
Mathematical rule or equation
6
Longest side of a right triangle
9
Distance from center to edge of circle
13
Symbol representing unknown value