Problem Solving Block
A regulation National Football League playing field is 120 yards long. A large Tyrannosaurus Rex measured about 42 feet long. Approximately how many T. Rex dinosaurs could fit in a line from one end of a regulation-sized football field to the other?
How many T. Rex dinosaurs can fit in a line from one end of the field to the other?A. 3 dinosaursB. 42 dinosaursC. 9 dinosaursD. None of the Above
What’s the Shape?
For the next few days, we’re going to spend some time on geometry. In the last geometry unit, you worked with 2-dimensional shapes, such as rectangles and triangles, and found the perimeter and area of some of these shapes. In this unit, you’re going to work with 3-dimensional shapes such as prisms and cylinders. You will also find the volume of rectangular prisms. First, you’re going to do an activity to help you remember the names of 3-D shapes and their attributes.
What’s the Shape?•Give each group one bag of shapes. (I may do this activity whole group)
•Each student will reach into the bag, feel an object, and describes it to the group.
•One student writes down the words and phrases used to describe the solid, and the other students guess what the object is.
•After students have described the object as completely as possible and made preliminary guesses, use the shapes to the right to guess which of the solids is being described.
•Then, have the student remove the shape from the bag, and the group members can check to see whether their guess was correct.
Discussion: Words We Use
Math Words We Use to Describe SolidsCreate a class chart. Ask students to share the mathematical words their group used to describe the shapes. As students suggest both informal and formal mathematical language, write down the words on the chart.
Click for an example chart:
Discussion: Words We Use
Math Words We Use to Describe SolidsAlthough informal language can be useful in describing shapes, precision in language is needed to define and classify shapes. Such as vertex, edge and face.
Guess My Shape?1. Label five brown paper bags A-E
2. Put a 3D Shape in each bag
3. Have students used the activity sheet on the next slide to describe the number of edges, faces & vertices without looking at the shape in the bag.
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a cylinderIt has 2 faces that are circles
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a cubeIt has 6 faces that are all squares
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a rectangular prism
It has 6 faces that are rectangles
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a
triangular prism
2 faces are triangles, but the
other 3 faces are rectangles
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a sphereIt has no faces and is shaped like a ball
3 Dimensional Figures3 Dimensional Figures
This 3-D figure is a pyramidThe bottom or base of a pyramid can be a square, rectangle,
hexagon, or a triangle, but the other faces are all triangles
Can you see beyond???Can you see beyond???
How many edges, faces, and vertices does this 3D figure have?
8 edges
16 angles
5 faces
Can you see beyond?Can you see beyond?
How many edges, faces, and vertices does this 3D figure have?
12 edges 6 faces
24 vertices