Across
1
Mathematical rule or equation
5
Line touching circle at one point
6
Total distance around a shape
7
Rectangular array of numbers
8
Parts per hundred
9
Number less than zero
10
Divisible by two
Down
2
Mathematical statement of equality
3
Longest side of a right triangle
4
Math using letters for unknown values
11
Comparison of two quantities
12
System of ordered marks for measuring
13
Value that does not change
14
Exact correspondence on both sides