Geometry Concepts on Area and Perimeter

A collection of vocabulary flashcards covering key concepts related to area and perimeter in geometry.

Perimeter

The distance around a polygon, or the sum of the lengths of its sides.

Area

The number of square units that covers the interior of a polygon.

Area of a Square Postulate

The area of a square is the square of the length of its side.

Area of a Rectangle

The area of a rectangle is the product of its base and height.

Area of a Parallelogram

The area of a parallelogram is the product of a base and its corresponding height.

Area of a Triangle

The area of a triangle is one-half the product of a base and its corresponding height.

Area Congruence Postulate

If two polygons are congruent, then they have the same area.

Area Addition Postulate

The area of a region is the sum of the areas of its non-overlapping parts.

Area of a Trapezoid

The area of a trapezoid is one-half the product of the height and the sum of the lengths of the bases.

Area of a Rhombus

The area of a rhombus is one-half the product of the lengths of its diagonals.

Area of a Kite

The area of a kite is one-half the product of the lengths of its diagonals.

Area of a Circle

The area of a circle is π times the square of the radius.

Sector of a Circle

A sector of a circle is the region bounded by two radii of the circle and their intercepted arc.

Central Angle of a Regular Polygon

An angle formed by two radii drawn to consecutive vertices of the polygon.

Apothem of a Polygon

The distance from the center to any side of the polygon; the perpendicular distance from the center to a side.

Area of a Regular Polygon

The area of a regular polygon is one-half the product of the apothem and the perimeter.

Similar Figures

Figures that have the same shape but may differ in size; the ratio of corresponding lengths is constant.

Scale Factor

The ratio of the lengths of corresponding sides of similar figures.

Special Right Triangle

30-60-90 triangle with specific angle measures, or a right triangle where the ratios of the sides are consistent and can be used to calculate missing lengths.