Across
1
Mathematical rule or equation
5
Exact correspondence on both sides
6
Space between two intersecting lines
7
Parts per hundred
8
Line crossing from corner to corner
15
Mathematical statement of equality
Down
2
Closed shape with straight sides
3
Repeated addition
4
Symbol representing unknown value
9
Number with digits after a point
10
Corner point of a polygon
11
Single numeral from 0 to 9
12
Math using letters for unknown values
13
Round shape with all points equidistant
14
Distance from center to edge of circle