Prentice Hall Geometry

Table 2 Formulas

A square has sides measuring s.
p equals 4 s
eh equals , s squared
Square
A rectangle has base b and height h.
p equals . 2 b plus 2 h

eh equals , b h
Rectangle
A parallelogram has base b and height h, connecting bases at a right angle.
eh equals , b h
Parallelogram
A triangle has base b and height h, from top vertex perpendicular to base.
eh equals , 1 half , b h
Triangle
A trapezoid has top base b subscript 1 baseline, bottom base b subscript 2 baseline, and height h perpendicular between bases.
eh equals . 1 half , h . open , b sub 1 , plus , b sub 2 )
Trapezoid
A regular polygon has perimeter p and apothem a, from center perpendicular to a side.
eh equals . 1 half , eh p
Regular Polygon
A rhombus has diagonals d subscript 1 baseline and d subscript 2 baseline.
eh equals , 1 half , d sub 1 , d sub 2
Rhombus (or Kite)
A triangle has vertex A, B, and C.
m angle , eh plus , m angle , b plus , m angle , c equals 180
Triangle Angle Sum
Triangle ABC has right angle at C with leg BC  measuring a, leg AC measuring b, and hypotenuse AB measuring c.
eh squared , plus , b squared , equals , c squared
Pythagorean Theorem
A right triangle has legs each measuring x opposite angles measuring 45 degrees and hypotenuse measuring x radical 2.
Ratio of sides equals 1 , colon 1 colon square root of 2
45 degrees , minus , 45 degrees , minus , 90 degrees Triangle
A right triangle has a leg measuring x opposite a 30 degree angle, a leg measuring x radical 3 opposite a 60 degree angle, and hypotenuse measuring 2x.
Ratio of sides equals 1 , colon square root of 3 colon 2
30 degrees , minus , 60 degrees , minus , 90 degrees Triangle
Triangle ABC has right angle at C with leg BC  measuring a, leg AC measuring b, and hypotenuse AB measuring c.
tangent eh equals . eh over b
sine eh equals , eh over c , cosine eh equals , b over c
Trigonometric Ratios

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Table of Contents

Prentice Hall Geometry Chapter 1 Tools of Geometry Chapter 2 Reasoning and Proof Chapter 3 Parallel and Perpendicular Lines Chapter 4 Congruent Triangles Chapter 5 Relationships Within Triangles Chapter 6 Polygons and Quadrilaterals Chapter 7 Similarity Chapter 8 Right Triangles and Trigonometry Chapter 9 Transformations Chapter 10 Area Chapter 11 Surface Area and Volume Chapter 12 Circles Skills Handbook Reference Visual Glossary Selected Answers Index Acknowledgments