Across
1
U-shaped curve of a quadratic function
4
Divisible by two
6
Three-sided polygon
7
Corner point of a polygon
8
Line touching circle at one point
9
Mathematical statement of equality
11
Result of addition
Down
2
Repeated addition
3
Parts per hundred
5
Math using letters for unknown values
10
Part of a circle's circumference
12
Single numeral from 0 to 9