Finding Perimeter and Side Lengths

This video tutorial explains how to calculate the perimeter of rectilinear shapes, which have straight sides meeting at right angles. It covers the process of adding side lengths, using number bonds for efficient calculation, and handling unknown side lengths by dividing shapes into rectangles. The video includes practice problems and a final challenge involving identical rectangles. It concludes with a call to explore more math resources.

What is a key characteristic of rectilinear shapes?

• They have curved sides.

• They have sides that meet at right angles.

• They are always circular.

• They have no sides.

How do you calculate the perimeter of a shape?

• Divide the lengths of all sides.

• Multiply the lengths of all sides.

• Add the lengths of all sides.

• Subtract the lengths of all sides.

What is the perimeter of a shape with sides measuring 8, 4, 6, 3, 2, and 7 meters?

• 50 meters

• 30 meters

• 20 meters

• 40 meters

What should you do if you don't know the length of every side of a shape?

• Guess the lengths.

• Use the known lengths to calculate the unknown ones.

• Ignore the unknown lengths.

• Measure the shape again.

How can dividing a shape into smaller rectangles help in finding unknown side lengths?

• It makes the shape circular.

• It changes the perimeter.

• It allows you to use known rectangle properties.

• It makes the shape more complex.

If a vertical line 'a' is made up of a 12 cm and a 4 cm line, what is its total length?

• 8 cm

• 24 cm

• 16 cm

• 20 cm

How do you find the length of a horizontal line 'B' if it is part of a 10 cm side and another 4 cm line?

• Multiply 10 cm by 4 cm.

• Divide 10 cm by 4 cm.

• Subtract 4 cm from 10 cm.

• Add 10 cm and 4 cm.

What is the perimeter of a shape if the missing side lengths are found to be 12 m and 6 m?

• 52 m

• 64 m

• 84 m

• 96 m

In the final challenge, what is the relationship between the length and width of each rectangle?

• The length is half the width.

• The length is twice the width.

• The length is equal to the width.

• The length is three times the width.

What is the perimeter of the shape made up of identical rectangles in the final challenge?

• 120 cm

• 130 cm

• 140 cm

• 150 cm