2-D shapes
I have 3 sides and 3 vertices. What shape am I?
A triangle.
I am perfectly round, I have no flat faces, and I can roll easily. What 3-D object am I?
A sphere.
If you trace the bottom of a brand-new glue stick onto paper, what 2-D shape will you draw?
A circle.
True or False: A cylinder and a cone belong in the same group. Why or why not?
True, because they both have a curved surface.
Think about a standard yellow post-it note or a slice of square bread. If you cut it perfectly in half from one corner straight across to the opposite corner, what two matching 2-D shapes did you just make?
Two triangles.
I have 4 straight sides that are all the exact same length. What shape am I?
A square.
If you have a collection of blocks and you want to build a tall tower, which 3-D objects would be a terrible choice to use for the bottom base of your tower? Why?
A sphere, because it is completely round and has no flat faces, so it will roll away instead of staying still and holding up other blocks!
Look at a standard dice. What 2-D shape makes up all of its faces?
A square.
If I am sorting shapes by "Has 4 vertices," which of these does not belong: Square, Rectangle, Triangle?
Triangle.
f you go outside to the playground, what 3-D object looks just like the ball we use to play four-square or soccer?
A sphere.
If you take a standard square and turn it slightly so it looks like a diamond, is it still a square? Why or why not?
Yes, it is still a square because turning it into a different position doesn't change its attributes (it still has 4 equal straight sides and 4 vertices).
Name a 3-D object that has a sharp point at the top and a circle on the bottom.
A cone.
A cylinder has how many flat circular faces?
2
What sorting rule separates a sphere from a cube?
Flat faces vs. curved surfaces
Think about an ice cream cone. If you hold it with the pointy end facing down, what 3-D object is it? If you flip it upside down to look like a birthday party hat, is it still the same 3-D object?
It is a cone, and yes, it is still a cone even when flipped upside down!
What is the difference between a square and a rectangle?
A square has 4 sides that are all equal, but a rectangle has 2 long sides and 2 short sides
Name the two 3-D object that can roll and stack.
A cylinder and a cone.
Imagine you are dipping the flat faces of 3-D objects into paint and stamping them on paper. If you stamp both flat ends of a cylinder, and then stamp all the faces of a cube, how many circles and how many squares will you have on your paper?
2 circles and 6 squares.
If I sort 2-D shapes into a group called "Shapes with more than 3 sides," name two shapes that can go inside.
Squares and rectangles.
Look at the screen of our classroom smartboard or a laptop computer. What 4-sided 2-D shape is this screen, where the opposite sides are equal, but it is not a square?
A rectangle.
If you put two identical triangles together side-by-side, what new 4-sided shape could you make?
A square
I have 6 flat faces that are all squares. What 3-D object am I?
A cube.
I am a 3-D object. I have 1 square face on the bottom and 4 triangular faces on the sides. What am I?
A pyramid.
I sorted a cone, a cylinder, and a sphere into one group. I put a cube and a rectangular prism in another group. What were my sorting rules?
Objects with curved surfaces vs. objects with only flat faces.
Think about a standard unsharpened wooden pencil or a brand-new stick of chalk. It has two flat circular faces on the ends, but it is long and stretched out. What is the geometric name of this 3-D object?
A cylinder.