Across
1
Exact correspondence on both sides
5
Single numeral from 0 to 9
6
Corner point of a polygon
7
Steepness of a line
8
Part of a line with two endpoints
9
Space between two intersecting lines
Down
2
U-shaped curve of a quadratic function
3
Number less than zero
4
Longest side of a right triangle
6
Amount of space an object occupies
10
Number with digits after a point
11
Mathematical statement of equality