Across
1
Number with digits after a point
3
Rectangle with four equal sides
4
Line segment connecting two circle points
5
Proven mathematical statement
6
Collection of distinct elements
7
Repeated addition
Down
2
Longest side of a right triangle
3
System of ordered marks for measuring
8
Mathematical rule or equation
9
Space between two intersecting lines
10
Rectangular array of numbers
11
Part of a circle's circumference