Find a perimeter by using a scale factor and a proportion.

Find a perimeter by using a scale factor and a proportion.

In this lesson you will learn how to compute an actual perimeter from a scale drawing by using ratios and proportions.

ADDITIONAL MATERIALS

STANDARDS

CCSS.7.G.A.1 Solve problems involving scale drawings of geometric figures, including computing actual lengths and areas from a scale drawing and reproducing a scale drawing at a different scale.

TEKS.7.5.C solve mathematical and real-world problems involving similar shape and scale drawings.

TEKS.8.10.A generalize the properties of orientation and congruence of rotations, reflections, translations, and dilations of two-dimensional shapes on a coordinate plane;

TEKS.G.10.B determine and describe how changes in the linear dimensions of a shape affect its perimeter, area, surface area, or volume, including proportional and non-proportional dimensional change.

IN.G.TS.3 Know properties of congruent and similar solids, including prisms, regular pyramids, cylinders, cones, and spheres; solve problems involving congruent and similar solids.

IN.7.GM.3 Solve real-world and other mathematical problems involving scale drawings of geometric figures, including computing actual lengths and areas from a scale drawing. Create a scale drawing by using proportional reasoning.

VA.CE.7.3 The student will solve single-step and multistep practical problems, using proportional reasoning.

VA.CE.7.2 The student will solve practical problems involving operations with rational numbers.

VA.TDF.G.14.b determining how changes in one or more dimensions of a figure affect area and/or volume of the figure;

FL.MAFS.7.G.1.1 Solve problems involving scale drawings of geometric figures, including computing actual lengths and areas from a scale drawing and reproducing a scale drawing at a different scale.