Nursing Preparation Study Guide

Nursing Preparation Study Guide

4.3.3 Area The area of a polygon is the measure of the surface area of the polygon. The calculation of the area of a polygon is dependent upon the type of polygon. Below are a few area formulas of common polygons you can expect to encounter on the TEAS exam. • Area of a Triangle = < 8 ℎ • Area of a Parallelogram (Square, Rhombus, or Rectangle) = ℎ • Area of a Trapezoid = < 8 ℎ( < + 8 ) Examples Find the area of the triangle.

Find the area of the trapezoid.

= 1 2 ℎ = 1 2 (5.0)(4.0) = 1 2 (20) = 10 cm 8

= 1 2 ℎ( < + 8 ) = 1 2 (2.5)(3.0 + 2.5) = 1 2 (2.5)(5.5) = 1 2 (13.75) = 6.875 cm 8

Notice when you find the area of a polygon the unit of measure becomes squared. 4.3.4 Circles A circle is not a polygon since it does not have any straight sides. However, it is a type of geometric figure you need to know for your TEAS exam. A circle is defined as a circular enclosed figure which has no edge or vertex. Circle can also be defined as the combination of all those points in a plane area which are positioned at a fixed distance from a fixed central point. This fixed distance is known as the radii while the fixed point is known as the center of the circle. Hence, any line joining the center of the circle with any point on the circle is known as radius. Any line joining any two points on the circle is called a chord. It should be noted that a chord may or may not pass through the center of the circle. The chord that passes from the center is the largest line and is termed as the diameter of the circle. Diameter is twice the radius.

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