PreAlgebra Farris 2015. * I can use scale drawings and construct scale drawings.

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Presentation transcript:

PreAlgebra Farris 2015

* I can use scale drawings and construct scale drawings.

* l60 l60

* Used to represent an object that is too large or too small to be drawn or built at actual size. * The lengths and widths of objects on a scale drawing or model are proportional to the lengths and widths of the actual object.

* Determined by the ratio of a given length on the drawing or model to its corresponding length on the actual object. 1 in = 3 ft 1 inch represents an actual distance of 3 feet

* Suppose a model of a dragonfly has a wing length of 4 centimeters. If the length of the insect’s actual wing is 6 centimeters, what is the scale of the model? Set up the proportion 4 cm = 1 cm 6 cm x cm X = 1.5 cm

* The scale drawing and the model have the same unit of measure, the scale can be written without units. (scale) 1 inch = 2 feet 1 inch 1 inch 1:24 (scale factor) 2 feet 24 inches

* The blueprint of a skateboard rap shows that is length is 11.4 inches. If the scale on the blueprint is 1 inch = 6 feet, what is the length of the actual skateboard ramp? 11.4 in 1 in = 6 ft Proportion plan length 1 in = 11.4 in Actual length 6 ft x ft X = 68.4

* The blueprint of a skateboard rap shows that is length is 11.4 inches. If the scale on the blueprint is 1 inch = 6 feet, what is the length of the actual skateboard ramp? 11.4 in 1 in = 6 ft Scale Factor 1 in = 1 in 6 ft 72 ft a represent actual length b represent blueprint length a = 72b = 72 (11.4) = inches OR 68.4 ft