Across
1
Total distance around a shape
7
Exact correspondence on both sides
8
Value that does not change
9
Corner point of a polygon
10
Rectangle with four equal sides
11
Line segment connecting two circle points
12
Amount of space an object occupies
Down
1
U-shaped curve of a quadratic function
2
Space between two intersecting lines
3
Round shape with all points equidistant
4
System of ordered marks for measuring
5
Proven mathematical statement
6
Longest side of a right triangle