Across
1
Math using letters for unknown values
4
Part of a line with two endpoints
5
System of ordered marks for measuring
8
Amount of space an object occupies
10
Rectangular array of numbers
13
Three-sided polygon
15
Space between two intersecting lines
Down
2
Parts per hundred
3
Mathematical statement of equality
6
Mathematical rule or equation
7
Round shape with all points equidistant
9
Single numeral from 0 to 9
11
Reference line in a graph
12
Distance from center to edge of circle
14
Number less than zero