Across
1
Exact correspondence on both sides
2
Amount of space an object occupies
3
Reference line in a graph
5
Line segment connecting two circle points
6
Total distance around a shape
7
Line crossing from corner to corner
8
Line touching circle at one point
Down
1
Rectangle with four equal sides
2
Symbol representing unknown value
4
Mathematical rule or equation
9
Collection of distinct elements
10
Sum divided by count
11
System of ordered marks for measuring
12
Result of raising a number to an exponent
13
Proven mathematical statement