Across
1
Single numeral from 0 to 9
3
Longest side of a right triangle
4
Lines that never intersect
7
U-shaped curve of a quadratic function
9
Result of addition
10
Collection of distinct elements
13
Difference between highest and lowest values
Down
2
Power to which a number is raised
5
Reference line in a graph
6
Part of a circle's circumference
8
Three-sided polygon
9
System of ordered marks for measuring
11
Number with digits after a point
12
Result of multiplication
14
Total distance around a shape