Across
1
Rectangle with four equal sides
2
Value that does not change
3
The number representing nothing
4
Repeated addition
5
Divisible by two
6
System of ordered marks for measuring
10
Proven mathematical statement
Down
1
Part of a line with two endpoints
2
Round shape with all points equidistant
7
Middle value in an ordered dataset
8
Result of addition
9
U-shaped curve of a quadratic function