Across
1
U-shaped curve of a quadratic function
3
Number divisible only by 1 and itself
6
Total distance around a shape
8
Line touching circle at one point
9
Round shape with all points equidistant
10
Number greater than zero
Down
2
Middle value in an ordered dataset
3
Result of raising a number to an exponent
4
Symbol representing unknown value
5
Three-sided polygon
7
System of ordered marks for measuring
11
Exact correspondence on both sides