Finding Perimeter on a Grid

This video tutorial explains how to find the perimeter of shapes on a grid. It begins with a rectangle example, emphasizing the importance of checking the scale, typically 1 cm per grid line. The process involves counting the lines around the shape to determine the perimeter. The tutorial also covers compound shapes, reiterating the method of counting lines rather than squares to find the perimeter.

What is the first step in finding the perimeter of a shape on a grid?

• Check the scale of the grid

• Calculate the area of the shape

• Measure the angles of the shape

• Count the squares inside the shape

Why is it important to check the scale of the grid?

• To know the length of each line segment

• To determine the color of the grid

• To find the area of the shape

• To identify the type of shape

What does a 1 cm square grid indicate?

• Each line is 1 cm long

• Each angle is 1 cm

• Each square is 1 cm²

• Each shape is 1 cm wide

What should you do if the grid scale is not mentioned?

• Use a ruler to measure

• Count the squares instead

• Skip the problem

• Assume each line is 1 cm

How do you find the perimeter of a rectangle on a grid?

• Count the squares inside the rectangle

• Add the lengths of all sides

• Multiply the length by the width

• Subtract the width from the length

What is the perimeter of a rectangle with 12 lines counted on a grid?

• 12 cm

• 6 cm

• 36 cm

• 24 cm

When counting lines for a compound shape, what should you avoid doing?

• Counting the lines around the outside

• Counting the squares around the outside

• Checking the scale

• Measuring the angles

What is the perimeter of a compound shape with 16 lines counted?

• 64 cm

• 32 cm

• 16 cm

• 8 cm

What is the key method to find the perimeter of any shape on a grid?

• Calculating the area

• Counting the squares inside the shape

• Measuring the angles

• Counting the lines around the shape

What is the perimeter of a shape if you count 20 lines on a 1 cm grid?

• 10 cm

• 20 cm

• 30 cm

• 40 cm