2-min Fluency Warm-up — Vertices in a flash!
A triangle has vertices.
A square has vertices.
A rectangle has vertices.
A hexagon has vertices.
Estimate First! Glance at each shape for ONE second. Guess how many sides — then count to check.
My guess: Actual count:
My guess: Actual count:
My guess: Actual count:
My guess: Actual count:
A polygon is a closed shape made only of straight sides. If a shape is open or has curves, it is NOT a polygon. Write yes or no.
Polygon?
Polygon?
Polygon?
Polygon?
Polygon?
Polygon?
Show Two Different Ways — A circle is not a polygon. Give two different reasons a shape might fail the polygon test.
Reason 1:
Reason 2:
Think about what is happening.
Jake drew a shape with 4 straight sides, but he forgot to connect the last side back to the start. His sister says it is a quadrilateral. Is she right? Explain.
My thinking:
Right or wrong?