Identifying 2D & 3D Shapes & Attributes — Answer Key
Part A: Trace the Words
Trace each word carefully by following the dotted lines.
1. vertex
2. side
3. flat
4. solid
5. round
6. shape
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A triangle has 3 sides.
A triangle is always made from 3 straight sides, which is why the word starts with "tri," meaning three. You can trace the sides with your finger to count them.
2. A cube is shaped like a box.
A cube matches a square box because it has 6 equal square faces and sharp corners on every side. Everyday cubes include dice and sugar cubes.
3. A flat shape is called a 2D shape.
A flat shape only has length and width, which are two dimensions, so we call it 2D. Shapes drawn on paper, like squares and triangles, are 2D.
4. A cylinder has 2 flat faces.
A cylinder has one round flat face on top and another on the bottom, making 2 flat faces in total. The curved surface in between does not count as a face.
Part C: True or False?
Read each statement. Circle True or False.
1. A triangle has 4 corners.
True False
False, because a triangle has only 3 sides, which means exactly 3 corners. A shape with 4 corners would be a square or rectangle instead.
2. A cone has one flat face on the bottom.
True False
True, because a cone sits on a circular base that is flat, while the rest of the shape curves up to a single point. That round flat bottom is its only face.
3. A rectangle is a flat 2D shape.
True False
True, because a rectangle can be drawn on paper using only length and width, with no thickness. All 2D shapes are flat like this.