Across
1
Round shape with all points equidistant
4
Exact correspondence on both sides
5
Result of multiplication
8
Mathematical rule or equation
9
Proven mathematical statement
10
Number less than zero
11
Longest side of a right triangle
12
Space between two intersecting lines
Down
2
Amount of space an object occupies
3
Repeated addition
4
Collection of distinct elements
6
Math using letters for unknown values
7
Difference between highest and lowest values
13
Single numeral from 0 to 9