Across
1
Rectangle with four equal sides
4
Line touching circle at one point
7
Symbol representing unknown value
8
Value that does not change
9
Corner point of a polygon
11
Result of addition
Down
1
Steepness of a line
2
Divisible by two
3
Comparison of two quantities
5
Result of multiplication
6
Part of a circle's circumference
10
Round shape with all points equidistant
12
Collection of distinct elements