Across
1
Amount of space an object occupies
2
Number greater than zero
4
Part of a circle's circumference
6
Number divisible only by 1 and itself
7
Math using letters for unknown values
8
Three-sided polygon
9
Difference between highest and lowest values
13
Mathematical rule or equation
Down
2
Total distance around a shape
3
Closed shape with straight sides
5
System of ordered marks for measuring
10
Repeated addition
11
Line segment connecting two circle points
12
Rectangle with four equal sides