VaaraVaara Classroom

Videos Practice Progress

Loading video…

Loading…

Loading video…

Find a missing boundary length

Ask Vaara

Your maths helper for this video

Loading…

Perimeter and Area · Solve boundary and missing side problems · 3:55

You'll learn: Use known sides and the perimeter total

Up next

15 videos

Now playing

Find a missing boundary length

3:55

Playing

Find a missing boundary length

You'll learn: Use known sides and the perimeter total

Now playing

Same topic

Solve boundary and missing side problems

1

Read a fencing problem carefully
3:46
Read a fencing problem carefully
You'll learn: Distinguish full perimeter from the material actually needed

Next topic

Understand area and square units

2

Area measures coverage
3:41
Area measures coverage
You'll learn: Cover a region without gaps or overlaps
The unit square changes the count
3:40
The unit square changes the count
You'll learn: Connect unit size to the numerical area measure

Next topic

Explain rectangle and square area methods

2

Rows and columns count the tiles
3:42
Rows and columns count the tiles
You'll learn: Derive rectangle area from a rectangular array
A square is a rectangle with equal sides
3:40
A square is a rectangle with equal sides
You'll learn: Apply the array reasoning to squares

Next topic

Estimate area and combine simple regions

3

Estimate coverage on a grid
3:44
Estimate coverage on a grid
You'll learn: Use full and partial squares to estimate area
Split a shape into known regions
3:56
Split a shape into known regions
You'll learn: Add non-overlapping rectangular areas
Remove a region to find what remains
3:43
Remove a region to find what remains
You'll learn: Subtract a known cut-out area

Next topic

Compare perimeter and area independently

3

Same area can have different perimeters
3:57
Same area can have different perimeters
You'll learn: Track coverage and exposed edges separately
Same perimeter can have different areas
3:52
Same perimeter can have different areas
You'll learn: Compare rectangular shapes with a fixed boundary length
Design under a boundary or coverage constraint
3:48
Design under a boundary or coverage constraint
You'll learn: Explain a choice using both measurements

Next topic

Explore triangle area by cutting a rectangle

3

A diagonal shares a rectangle into equal areas
3:42
A diagonal shares a rectangle into equal areas
You'll learn: Explain half-area by cutting and matching
Different triangles can share the same area
3:46
Different triangles can share the same area
You'll learn: Extend the rectangle comparison using two pieces
Use triangle pieces in an area puzzle
3:48
Use triangle pieces in an area puzzle
You'll learn: Calculate a composite region with the taught method

Next topic

Recognise the need for fractional units

1

Whole units are sometimes too coarse
3:26
Whole units are sometimes too coarse
You'll learn: Recognise why a smaller unit is needed