Across
1
Rectangle with four equal sides
3
Reference line in a graph
4
Parts per hundred
5
The number representing nothing
7
Longest side of a right triangle
9
Collection of distinct elements
10
Lines that never intersect
Down
1
System of ordered marks for measuring
2
Three-sided polygon
3
Space between two intersecting lines
4
Result of raising a number to an exponent
6
Result of multiplication
8
Exact correspondence on both sides