Wrapping Up Geometry Lesson 1 Wrapping Up Geometry

Wrapping Up Geometry Lesson 1

Wrapping Up Geometry Learning Objective Today we will explore how to represent threedimensional (3 -D) figures using nets. back front top left bottom front right back

Surface Area… What do you think about when you think of the word surface? What do you think about when you think of the word area?

QUICK WRITE With your teams, discuss and create a list about what you think surface area is. Surface Area Hint: Think about the meanings of the two words individually.

Surface Area is… The surface area of a three-dimensional figure is the sum of the areas of the faces of the figure. (What we get when we find the area of each face of the 3 -D object, then add all the areas up!) All 3 -D figures have a surface area that can be found by using a net. A net is a 2 -D drawing that can be folded in a 3 -D object.

Guided Practice Each team will get a worksheet that has some nets on it. Cut each net out separately along the outer edges. DO NOT cut along the interior edges that connect any two faces together. Once cut out, fold along the interior edges to determine which nets create rectangular prisms. If the net forms a prism, tape it to hold the prism’s shape.

Independent Practice Now that we recognize that a net of a rectangular prism is constructed of three pairs of congruent and parallel faces, you are going to work independently to determine if a set of nets will form rectangular prisms. You will not be allowed to cut or fold these nets. You will be using visual inspection. Once you have indicated yes or no, explain your reasoning by answering in complete sentences, restating the question.

Coming up next… A gift-wrapped present… What does it look like when it is unwrapped? Stay tuned…