Across
1
Collection of distinct elements
3
Mathematical rule or equation
6
Round shape with all points equidistant
7
Closed shape with straight sides
8
Rectangular array of numbers
12
Longest side of a right triangle
Down
2
Distance from center to edge of circle
4
Part of a circle's circumference
5
Amount of space an object occupies
9
Symbol representing unknown value
10
Steepness of a line
11
Exact correspondence on both sides
13
Comparison of two quantities