Across
1
Three-sided polygon
5
Mathematical statement of equality
7
Amount of space an object occupies
8
Difference between highest and lowest values
9
Distance from center to edge of circle
Down
2
The number representing nothing
3
Rectangle with four equal sides
4
Total distance around a shape
6
Line crossing from corner to corner
10
Comparison of two quantities
11
Parts per hundred
12
System of ordered marks for measuring