Across
1
Reference line in a graph
4
Result of raising a number to an exponent
5
System of ordered marks for measuring
6
Parts per hundred
10
Part of a circle's circumference
11
Total distance around a shape
13
Amount of space an object occupies
Down
2
Value that does not change
3
Result of addition
6
Lines that never intersect
7
Three-sided polygon
8
Round shape with all points equidistant
9
Part of a line with two endpoints
12
Number divisible only by 1 and itself