Fundamentals of Math

Fundamentals of Mathematics

Chapter 5 Summary

Vocabulary

Acute Angles

Equilateral Triangle

Perimeter

Right Angles

Acute Triangle

Plane

Right Triangle

Isosceles Trapezoids

Angle

Plane Geometry

Scalene Triangle

Area

Polygon

Similar

Isosceles Triangle

Chord

Pythagorean Theorem

Square

Kites

Circle

Straight Angles

Lines

Quadrilateral

Circumference

Trapezoids

Obtuse Angles

Radius

Diameter

Vertex

Obtuse Triangle

Rectangle

Equiangular Triangle

Parallelograms

Rhombus

Formulas

• Pythagorean Theorem: 2 + 2 = 2 • Perimeter: Add together all the side lengths of a polygon. • Circumference: = 2 = • Area: o Triangle: = 1 2 ℎ o Parallelogram, Rectangle, Rhombus, or Square:

= Length × Width (or Base ×

Height) o Trapezoid or Isosceles Trapezoid:

= 1 2

)

ℎ( 1

+ 2

= 1 2

o Kite:

( 1

× 2

)

2

o Circle:

=

Don’t Forget

• Angles that measure between 0° and 90° are acute, exactly 90° are right, between 90° and 180° are obtuse, and exactly 180° are straight. • All the interior angles of a triangle add to 180° . • Build a proportion to find the missing side length of similar figures. • With circles, leave the answer in terms of unless told it is okay to approximate your answer.

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