Holt Geometry 9-3 Composite Figures Warm Up Find the area of each figure. 1. a rectangle in which b = 14 cm and h = 5 cm 2. a triangle in which b = 6 in.

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Presentation transcript:

Holt Geometry 9-3 Composite Figures Warm Up Find the area of each figure. 1. a rectangle in which b = 14 cm and h = 5 cm 2. a triangle in which b = 6 in. and h = 18 in. 3. a trapezoid in which b 1 = 7 ft, b 2 = 11 ft, and h = 3 ft

Holt Geometry 9-3 Composite Figures Use the Area Addition Postulate to find the areas of composite figures. Use composite figures to estimate the areas of irregular shapes. Objectives

Holt Geometry 9-3 Composite Figures A composite figure is made up of simple shapes, such as triangles, rectangles, trapezoids, and circles. To find the area of a composite figure, find the areas of the simple shapes and then use the Area Addition Postulate.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures Find the shaded area. Round to the nearest tenth, if necessary.

Holt Geometry 9-3 Composite Figures To estimate the area of an irregular shape, you can sometimes use a composite figure. First, draw a composite figure that resembles the irregular shape. Then divide the composite figure into simple shapes.

Holt Geometry 9-3 Composite Figures Use a composite figure to estimate the shaded area. The grid has squares with a side length of 1 ft.

Holt Geometry 9-3 Composite Figures Use a composite figure to estimate the shaded area. The grid has squares with side lengths of 1 ft.

Holt Geometry 9-3 Composite Figures Lesson Quiz: Part I Find the shaded area. Round to the nearest tenth, if necessary

Holt Geometry 9-3 Composite Figures Lesson Quiz: Part II 3.Mike is remodeling his kitchen. The countertop he wants costs $2.70 per square foot. How much will Mike have to spend on his remodeling project?

Holt Geometry 9-3 Composite Figures Lesson Quiz: Part III 4.Use a composite figure to estimate the shaded area. The grid has squares with side lengths of 1 cm.

Holt Geometry 9-3 Composite Figures Homework pg evens 38-42evens