Geometry Warm-Up1/13/11. In a triangle, the ratio of the measures of three sides is 3:4:5, and the perimeter is 42 feet. Find the measure of the longest side of the triangle.
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In a triangle, the ratio of the measures of three sides is 3:4:5, and the perimeter is 42 feet. Find the measure of the longest side of the triangle.
A boxcar on a train has a length of 40 feet and a width of 9 feet. A scale model is made with a length of 16 inches. Find the width of the model.
Sec. 7.2: Similar Polygons
January 13, 2011
Similar – same shape but different size
ABCD ~ GEFH
AB = BC = CD = AD
GE EF FH GH
Ex. 2: You have been asked to create a poster to advertise a field trip to see the Liberty Bell. You have a 3.5 inch by 5 inch photo that you want to enlarge. You want the enlargement to be 16 inches wide. How long will it be?
X = 22.9 inches
The length of the enlargement will be about 23 inches.
Scale Factor – the ratio of the lengths of two corresponding sides of similar polygons
Y = 19.2