Across
1
Number less than zero
2
System of ordered marks for measuring
5
Space between two intersecting lines
6
Total distance around a shape
8
Three-sided polygon
9
Number with digits after a point
Down
2
Rectangle with four equal sides
3
Divisible by two
4
Line touching circle at one point
7
Result of raising a number to an exponent
10
Part of a circle's circumference