Across
1
Number less than zero
5
Space between two intersecting lines
6
System of ordered marks for measuring
7
Line touching circle at one point
10
Sum divided by count
11
Result of raising a number to an exponent
12
Distance from center to edge of circle
Down
2
Number divisible only by 1 and itself
3
U-shaped curve of a quadratic function
4
Rectangle with four equal sides
8
Symbol representing unknown value
9
Longest side of a right triangle