Across
1
Part of a whole number
5
Longest side of a right triangle
6
Proven mathematical statement
7
Three-sided polygon
9
System of ordered marks for measuring
10
Difference between highest and lowest values
Down
1
Mathematical rule or equation
2
Closed shape with straight sides
3
Mathematical statement of equality
4
Exact correspondence on both sides
8
Collection of distinct elements
11
Line segment connecting two circle points
12
Part of a circle's circumference
13
Steepness of a line