Across
1
Math using letters for unknown values
4
Longest side of a right triangle
6
Parts per hundred
7
Space between two intersecting lines
11
Distance from center to edge of circle
12
Part of a line with two endpoints
Down
2
Three-sided polygon
3
Amount of space an object occupies
5
Sum divided by count
8
Total distance around a shape
9
Number divisible only by 1 and itself
10
Collection of distinct elements