Across
1
Number less than zero
3
U-shaped curve of a quadratic function
5
Repeated addition
6
System of ordered marks for measuring
7
Steepness of a line
8
Three-sided polygon
10
Rectangular array of numbers
13
Comparison of two quantities
Down
2
Total distance around a shape
3
Result of raising a number to an exponent
4
Parts per hundred
9
Reference line in a graph
11
Corner point of a polygon
12
Line crossing from corner to corner