Across
1
System of ordered marks for measuring
4
Three-sided polygon
5
Rectangular array of numbers
6
Longest side of a right triangle
7
Part of a whole number
10
U-shaped curve of a quadratic function
11
Round shape with all points equidistant
Down
2
Space between two intersecting lines
3
Lines that never intersect
8
Rectangle with four equal sides
9
Number greater than zero
12
Middle value in an ordered dataset