Across
1
Part of a circle's circumference
2
Amount of space an object occupies
3
Three-sided polygon
5
Math using letters for unknown values
10
Repeated addition
12
Mathematical rule or equation
13
Mathematical statement of equality
Down
2
Corner point of a polygon
4
Number with digits after a point
6
Result of multiplication
7
Distance from center to edge of circle
8
Rectangle with four equal sides
9
Divisible by two
11
Space between two intersecting lines