Across
1
Single numeral from 0 to 9
3
U-shaped curve of a quadratic function
6
Longest side of a right triangle
8
Line segment connecting two circle points
9
Distance from center to edge of circle
10
Rectangle with four equal sides
11
Divisible by two
15
Difference between highest and lowest values
Down
2
Round shape with all points equidistant
4
Result of multiplication
5
Sum divided by count
7
Part of a circle's circumference
12
Result of raising a number to an exponent
13
Corner point of a polygon
14
Exact correspondence on both sides