Scale Drawings. Scale – The ratio that compares the measurements of the real object and its model. EX: 1 in = 6 ft Scale factor – written as a ratio without.

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Scale Drawings and Scale Models

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Scale Drawings

Scale – The ratio that compares the measurements of the real object and its model. EX: 1 in = 6 ft Scale factor – written as a ratio without measurements and in simplest form EX: the scale factor of 1 in = 6 ft is 1/72

Identify the scale factor. ActualModel Length (in.)122 Wing span (in.)183 model length actual length = 2 12 = 1616 Write a ratio using one of the dimensions. Simplify. EX1) EX2) The scale is 1 inch = 3 feet. What is the scale factor? 1 inch 3 feet = To eliminate units convert 3 feet to inches. Conversion factor is 1 foot = 12 inches 1 inch 36 inches 1 36 =

= Find the Scale Factor from the following shape 12 3 original Model Original 3 12 Scale factor = 1 4 large small 12 3 Model original large small = Model Original 12 3 Scale factor = 4 1 EX3)

A photograph was enlarged and made into a poster. The poster is 20.5 inches by 36 inches. The scale factor is 5. Find the size of the photograph. Think: poster photo = l = 36 X 1= ÷ 5 = 7.2 Write a proportion to find the length l and width w. Solve the proportion. Draw a picture. poster photo l w poster photo = w = 20.5 X 1= ÷ 5 = 4.1 EX4)

Notes start here

Scaling Drawings Date _______

Scale – The ratio that compares the _________________ of the _____ object and its _______. EX: 1 in = 6 ft Scale _______ – written as a ratio _______ measurements and in ________________ EX: the scale factor of 1 in = 6 ft is _______

Identify the scale factor. ActualModel Length (in.) Wing span (in.) model length actual length = = Write a ratio using one of the dimensions. Simplify. 1 inch 3 feet = To eliminate units convert 3 feet to inches. Conversion factor is __________________ = EX1) EX2) The scale is 1 inch = 3 feet. What is the scale factor?

= Find the Scale Factor from the following shape 12 3 original Model Original Scale factor = large small 12 3 Model original large small = Model Original Scale factor = EX3)

A photograph was enlarged and made into a poster. The poster is 20.5 inches by 36 inches. The scale factor is. Find the size of the photograph Think: poster photo EX4)