Across
1
Part of a line with two endpoints
4
Closed shape with straight sides
5
System of ordered marks for measuring
7
Exact correspondence on both sides
8
Longest side of a right triangle
12
Difference between highest and lowest values
Down
2
Power to which a number is raised
3
Rectangle with four equal sides
6
Single numeral from 0 to 9
7
Result of addition
9
Line segment connecting two circle points
10
Repeated addition
11
Result of multiplication