Across
1
Repeated addition
4
Divisible by two
7
Closed shape with straight sides
8
Round shape with all points equidistant
9
Longest side of a right triangle
11
Total distance around a shape
Down
2
Result of raising a number to an exponent
3
Rectangle with four equal sides
5
Three-sided polygon
6
Number with digits after a point
10
Proven mathematical statement
12
Part of a circle's circumference