Across
1
System of ordered marks for measuring
4
Difference between highest and lowest values
5
Line touching circle at one point
6
Sum divided by count
11
Amount of space an object occupies
12
Longest side of a right triangle
Down
1
Steepness of a line
2
Power to which a number is raised
3
Mathematical rule or equation
7
Round shape with all points equidistant
8
Three-sided polygon
9
Symbol representing unknown value
10
Repeated addition
13
Number greater than zero