Across
1
Divisible by two
4
Space between two intersecting lines
5
U-shaped curve of a quadratic function
8
Three-sided polygon
11
Number divisible only by 1 and itself
12
Distance from center to edge of circle
13
Single numeral from 0 to 9
Down
2
Amount of space an object occupies
3
Part of a whole number
6
Mathematical rule or equation
7
Symbol representing unknown value
9
Longest side of a right triangle
10
Number that divides evenly into another