Across
1
Longest side of a right triangle
5
Math using letters for unknown values
6
Closed shape with straight sides
7
Difference between highest and lowest values
9
Space between two intersecting lines
12
Three-sided polygon
Down
2
System of ordered marks for measuring
3
Round shape with all points equidistant
4
Lines that never intersect
8
Rectangle with four equal sides
10
Single numeral from 0 to 9
11
Corner point of a polygon
13
Split into equal parts
14
U-shaped curve of a quadratic function