# 5th grade Unit 4 Math - Positively Perfect Plane Figures

### 17 terms by apcoker

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### area

the number of square units needed to cover a surface

### square units (sq.units)

a unit of area with dimensions 1 unit x 1 unit

### formula

a set of symbols that expresses a mathematical rule

### tiling

a repeating pattern of closed figures that covers a surface with no gaps and no overlaps

### polygon

a plane shape having 3 or more straight side

### regular polygon

polygon with all sides and all angles equal

### irregular polygon

a polygon with all sides and all angles not equal

### parallelogram

a quadrilateral whose opposite sides are parallel and congruent

### congruence

having the same size and shape

### face

the side of a three dimensional figure

### edge

the line made where two or more faces of a solid figure meet

### vertex (vertices)

the point where two or more rays meet; the point of intersection of 2 sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone

### angle

a figure formed by two rays that meet at a common endpoint

### circumference

the distance around a circle

### diameter

a line segment passing through the center of a circle with both ends touching the circumference

a line segment with one endpoint at the center of the circle and the other endpoint on the circle

### pi

the relationship of the circle's circumference to its diameter, when used in calculations, pi is typically approximated as 3.14

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