Slide 9 - 1 Copyright © 2009 Pearson Education, Inc. Pythagorean Theorem The sum of the squares of the lengths of the legs of a right triangle equals the.

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Presentation transcript:

Slide Copyright © 2009 Pearson Education, Inc. Pythagorean Theorem The sum of the squares of the lengths of the legs of a right triangle equals the square of the length of the hypotenuse. leg 2 + leg 2 = hypotenuse 2 Symbolically, if a and b represent the lengths of the legs and c represents the length of the hypotenuse (the side opposite the right angle), then a 2 + b 2 = c 2 a b c

Slide Copyright © 2009 Pearson Education, Inc. Example Tomas is bringing his boat into a dock that is 12 feet above the water level. If a 38 foot rope is attached to the dock on one side and to the boat on the other side, determine the horizontal distance from the dock to the boat. 12 ft 38 ft rope

Slide Copyright © 2009 Pearson Education, Inc. Circles A circle is a set of points equidistant from a fixed point called the center. A radius, r, of a circle is a line segment from the center of the circle to any point on the circle. A diameter, d, of a circle is a line segment through the center of the circle with both end points on the circle. The circumference is the length of the simple closed curve that forms the circle.

Slide Copyright © 2009 Pearson Education, Inc. Example Terri is installing a new circular swimming pool in her backyard. The pool has a diameter of 27 feet. How much area will the pool take up in her yard? (Use π = 3.14.)

Slide Copyright © 2009 Pearson Education, Inc. Volume Volume is the measure of the capacity of a figure. It is the amount of material you can put inside a three-dimensional figure. Surface area is sum of the areas of the surfaces of a three-dimensional figure. It refers to the total area that is on the outside surface of the figure.

Slide Copyright © 2009 Pearson Education, Inc. Volume Formulas Sphere Cone V =  r 2 h Cylinder V = s 3 Cube V = lwhRectangular Solid DiagramFormulaFigure

Slide Copyright © 2009 Pearson Education, Inc. Surface Area Formulas Sphere Cone SA = 2  rh + 2  r 2 Cylinder SA= 6s 2 Cube SA = 2lw + 2wh +2lhRectangular Solid DiagramFormulaFigure

Slide Copyright © 2009 Pearson Education, Inc. Volume of a Prism V = Bh, where B is the area of the base and h is the height. Example: Find the volume of the figure. 8 m 6 m 4 m

Slide Copyright © 2009 Pearson Education, Inc. Volume of a Pyramid where B is the area of the base and h is the height. Example: Find the volume of the pyramid. 12 m 18 m