Across
1
Part of a circle's circumference
3
Divisible by two
4
Closed shape with straight sides
5
Mathematical statement of equality
6
Part of a line with two endpoints
7
Proven mathematical statement
11
Result of raising a number to an exponent
Down
2
Line touching circle at one point
8
Mathematical rule or equation
9
Three-sided polygon
10
Middle value in an ordered dataset
12
Number divisible only by 1 and itself