Across
1
Parts per hundred
5
System of ordered marks for measuring
6
Result of raising a number to an exponent
8
Closed shape with straight sides
9
Result of addition
11
Rectangle with four equal sides
Down
2
Longest side of a right triangle
3
Round shape with all points equidistant
4
Space between two intersecting lines
7
Mathematical statement of equality
10
Single numeral from 0 to 9
12
Part of a circle's circumference
13
Value that does not change