Across
1
Number greater than zero
3
Result of addition
4
System of ordered marks for measuring
5
Value that does not change
10
Three-sided polygon
Down
1
Closed shape with straight sides
2
Rectangle with four equal sides
3
Exact correspondence on both sides
4
Steepness of a line
6
Line crossing from corner to corner
7
Round shape with all points equidistant
8
Single numeral from 0 to 9
9
Result of raising a number to an exponent