Across
1
Rectangular array of numbers
4
Line crossing from corner to corner
5
Total distance around a shape
6
Comparison of two quantities
10
Space between two intersecting lines
Down
1
Repeated addition
2
Number with digits after a point
3
Number greater than zero
7
System of ordered marks for measuring
8
Number that divides evenly into another
9
Three-sided polygon
11
Value that does not change
12
Steepness of a line
13
Round shape with all points equidistant