Across
1
Number divisible only by 1 and itself
4
Math using letters for unknown values
6
Longest side of a right triangle
8
Exact correspondence on both sides
10
Number less than zero
Down
2
Split into equal parts
3
Line touching circle at one point
5
Repeated addition
7
Part of a whole number
9
Amount of space an object occupies
11
Round shape with all points equidistant