Find the area of each figure. Round to the nearest tenth if necessary.

1. 2.

3. What is the area of the figure at

the right? Round to the nearest

tenth.

Course 2, Lesson 8-4

Course 2, Lesson 8-4

ANSWERS

1. 45 cm²

2. 67 mi²

3. 85.7 in²

Geometry

Course 2, Lesson 8-4

HOW do measurements help you describe real-world objects?

Course 2, Lesson 8-4 Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.

Geometry

• 7.G.6Solve real-world and mathematical problems involving area, volume and surface area of two- and three-dimensional objects composed of triangles, quadrilaterals, polygons, cubes, and right prisms.

Mathematical Practices

1 Make sense of problems and persevere in solving them.

2 Reason abstractly and quantitatively.

3 Construct viable arguments and critique the reasoning of others.

4 Model with mathematics.

•To find the volume of rectangular prism•To find the volume of a triangular prism

Course 2, Lesson 8-4

Geometry

Course 2, Lesson 8-4

Geometry

•volume

Volume of a Rectangular Prism

Course 2, Lesson 8-4

Geometry

Words The volume V of a rectangular prism is the product of the length , the width w, and the height h. It is also the area of the base B times the height h.

Symbols V = wh or V = Bh

Model

Volume of a Triangular Prism

Course 2, Lesson 8-4

Geometry

Words The volume V of a triangular Model prism is the area of the base B times the height h.

Symbols V = Bh, where B is the area of the base.

How did what you learned today help you answer the

Course 2, Lesson 8-4

Geometry

HOW do measurements help you describe real-world objects?

How did what you learned today help you answer the

Course 2, Lesson 8-4

Geometry

HOW do measurements help you describe real-world objects?

Sample answers:• To find the amount a rectangular-shaped box can hold• To find the amount a triangular-shaped box can hold

Measure and find thevolume of a rectangularor triangular prism found

in your classroom.

Course 2, Lesson 8-4

Ratios and Proportional Relationships

FunctionsGeometry