Across
1
Line crossing from corner to corner
3
Exact correspondence on both sides
5
Longest side of a right triangle
7
Rectangle with four equal sides
Down
2
Mathematical statement of equality
4
Mathematical rule or equation
6
Distance from center to edge of circle
8
Result of addition
9
Difference between highest and lowest values
10
Number divisible only by 1 and itself
11
Repeated addition