Across
1
Part of a whole number
3
Distance from center to edge of circle
4
Divisible by two
8
Collection of distinct elements
10
Number divisible only by 1 and itself
11
Line crossing from corner to corner
Down
2
U-shaped curve of a quadratic function
3
Difference between highest and lowest values
5
Symbol representing unknown value
6
Total distance around a shape
7
Single numeral from 0 to 9
9
Part of a circle's circumference