Across
1
Part of a circle's circumference
4
Line segment connecting two circle points
5
Line touching circle at one point
7
System of ordered marks for measuring
11
Longest side of a right triangle
Down
2
Number with digits after a point
3
Round shape with all points equidistant
6
Corner point of a polygon
8
Number less than zero
9
Repeated addition
10
Part of a whole number