Across
1
Closed shape with straight sides
4
Middle value in an ordered dataset
5
Longest side of a right triangle
7
Mathematical rule or equation
9
Round shape with all points equidistant
10
Repeated addition
Down
1
Lines that never intersect
2
System of ordered marks for measuring
3
The number representing nothing
6
Number less than zero
8
Result of multiplication
11
Number divisible only by 1 and itself