Across
1
Parts per hundred
4
Round shape with all points equidistant
7
Repeated addition
9
Result of raising a number to an exponent
10
Value that does not change
11
System of ordered marks for measuring
13
Symbol representing unknown value
Down
2
Math using letters for unknown values
3
Corner point of a polygon
5
Three-sided polygon
6
Reference line in a graph
8
Lines that never intersect
12
Rectangle with four equal sides