Across
1
Exact correspondence on both sides
4
Divisible by two
5
Part of a circle's circumference
6
Mathematical rule or equation
7
Distance from center to edge of circle
8
Steepness of a line
10
Result of multiplication
Down
1
Result of addition
2
Round shape with all points equidistant
3
Three-sided polygon
9
Number that divides evenly into another
11
Collection of distinct elements
12
Longest side of a right triangle