Across
1
Part of a line with two endpoints
4
Divisible by two
5
Value that does not change
6
Math using letters for unknown values
7
Amount of space an object occupies
10
Rectangle with four equal sides
13
Result of raising a number to an exponent
Down
2
Lines that never intersect
3
Collection of distinct elements
4
Mathematical statement of equality
5
Line segment connecting two circle points
8
Distance from center to edge of circle
9
U-shaped curve of a quadratic function
11
Repeated addition
12
Space between two intersecting lines