Across
1
Amount of space an object occupies
3
Single numeral from 0 to 9
5
Math using letters for unknown values
6
Steepness of a line
7
Proven mathematical statement
8
Three-sided polygon
12
Mathematical rule or equation
Down
2
Line touching circle at one point
4
Repeated addition
6
Part of a line with two endpoints
9
Lines that never intersect
10
Distance from center to edge of circle
11
Number divisible only by 1 and itself
13
Sum divided by count
14
System of ordered marks for measuring