Across
1
Divisible by two
3
Rectangle with four equal sides
4
Sum divided by count
7
Rectangular array of numbers
9
Number with digits after a point
10
U-shaped curve of a quadratic function
Down
2
Round shape with all points equidistant
3
System of ordered marks for measuring
5
Symbol representing unknown value
6
Amount of space an object occupies
8
Three-sided polygon