Classroom assessment; perimeter activity

What pattern did the perimeter of the triangles increase by with each triangle added?

• Increased by 1

• Increased by 3s

• Increased by 6

• Increased by 2

Which shape had the highest slope in your graph?

What shape had the lowest slope on your graph?

• Triangle

• Trapezoid

• Parallelogram

• Hexagon

How do you find the perimeter of a shape?

• Multiply all the sides together

• Multiply length x width

• Add the length of the sides together

• Add the number of vertices together

Why did the hexagon have the biggest increase in perimeter?

Answer explanation

Because it started off with 6 triangles to make up the hexagon, so each time we add another hexagon it increases by 6 but decreases by 2. So the slope is an increase of 4.

Draw a trapezoid

Why did the perimeter of the parallelogram increase by 2 each time?