Across
1
Line crossing from corner to corner
2
Result of raising a number to an exponent
5
Number with digits after a point
6
Number less than zero
7
Amount of space an object occupies
9
Part of a circle's circumference
12
Line touching circle at one point
13
Exact correspondence on both sides
Down
2
Closed shape with straight sides
3
Lines that never intersect
4
Round shape with all points equidistant
5
Split into equal parts
8
Line segment connecting two circle points
10
Three-sided polygon
11
Sum divided by count