2D Shapes & Properties — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. Which shape has the most lines of symmetry?
A) triangle
B) square
C) circle
D) rectangle
A circle has infinitely many lines of symmetry — any line through the center works.
2. Which shape has 4 sides that are all the same length?
A) rectangle
B) triangle
C) square
D) hexagon
A square has 4 equal sides. A rectangle has 4 sides but they are not all the same length.
3. If you put 2 triangles together, what shape can you make?
A) circle
B) square
C) hexagon
D) pentagon
Two right triangles placed together along their longest side can form a square.
4. Which shape has 0 sides and 0 corners?
A) square
B) triangle
C) hexagon
D) circle
Only a circle has 0 sides and 0 corners — it is a perfectly round curve.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A square has 4 lines of symmetry.
A square has 4 lines of symmetry: 2 through the midpoints of sides and 2 diagonal.
2. A shape with 5 sides and 5 vertices is a pentagon.
A pentagon has exactly 5 sides and 5 vertices. Penta means five.
3. A triangle has 3 fewer sides than a hexagon.
A hexagon has 6 sides and a triangle has 3 sides. 6 - 3 = 3 fewer sides.
4. You can put 6 triangles together to make a hexagon.
Six equilateral triangles arranged around a center point form a regular hexagon.
5. Both a square and a rectangle have 4 sides.
Both squares and rectangles are quadrilaterals — they each have exactly 4 sides.