Across
1
Amount of space an object occupies
4
Three-sided polygon
5
Math using letters for unknown values
7
Number that divides evenly into another
9
Round shape with all points equidistant
10
Number divisible only by 1 and itself
11
Total distance around a shape
Down
2
Line crossing from corner to corner
3
Steepness of a line
6
Difference between highest and lowest values
7
Part of a whole number
8
Value that does not change
12
Result of raising a number to an exponent