Educational "Colour by 2D Shapes" activity sheets for children, designed to teach shape recognition through fun coloring exercises.

Let’s go through each picture one by one and figure out which shapes to color based on the key.

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Top Left: Sun

Key says:
- Circle = yellow
- Triangle = orange

The sun has:
- 1 big circle in the middle → color it yellow
- 8 triangles around it → color them all orange

✔ Done.

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Top Middle: Sailboat

We need to find the key — but wait, the key is cut off! Let’s look at the other pictures to see if we can guess or if there’s a pattern.

Actually, looking again — the top middle image doesn’t show its full key. But since this is a “Colour by 2D Shapes” worksheet, and the other images have keys, maybe we’re meant to use the same shape-color rules across? Not necessarily — each might have its own key.

Wait — let’s check the bottom left (house) — it has a full key:

Bottom Left Key:
- Square = red
- Circle = blue
- Triangle = yellow
- Rectangle = green

But that’s for the house. The sailboat might have different colors assigned.

Hmm… actually, looking closely at the original image layout — each box has its own small key in the top-left corner of that box.

For the sailboat, the visible part of the key shows:
- Triangle = ? (cut off)
- Square = ? (cut off)

This is tricky. Maybe the worksheet expects us to assume consistent coloring? Or perhaps it’s an error?

Wait — let’s look at the rocket (top right). Its key is also partially cut off, but we can see:
- Rectangle = ?
- Circle = ?

Again, not fully visible.

BUT — here’s a better idea: Since this is a student worksheet, and the instruction is “Use your colour key to complete the picture”, and only some keys are fully visible, perhaps the intention is that students refer to their printed version where all keys are clear.

Since we don’t have the full keys for every image, let’s focus on the ones with COMPLETE keys.

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Top Right: Rocket

Visible key parts:
- Rectangle = ? (looks like maybe purple?)
- Circle = ? (maybe pink?)

Not clear. Skip for now.

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Bottom Left: House

Full key given:
- Square = red
- Circle = blue
- Triangle = yellow
- Rectangle = green

Now count shapes in the house:

House body = rectangle → green
Roof = triangle → yellow
Chimney = rectangle → green
Smoke bubbles = circles → blue (there are 3 small circles above chimney)
Windows = squares → red (4 windows)
Door = square → red
Base line under house? Probably not counted as a shape to color.

So:
- Color roof (triangle) → yellow
- Color chimney and main house (rectangles) → green
- Color 4 windows + door (squares) → red
- Color 3 smoke bubbles (circles) → blue

✔ Done.

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Bottom Middle: Flowers

Key is cut off — only shows:
- Triangle = ?
- Circle = ?
- Square = ?

Can’t be sure. Skip.

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Bottom Right: Train

No key shown at all in the crop. Can’t solve without key.

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Wait — maybe I missed something. Let me re-examine the entire sheet.

Actually, looking back — the FIRST image (sun) has a complete key:
> Circle = yellow
> Triangle = orange

And the HOUSE has a complete key:
> Square = red
> Circle = blue
> Triangle = yellow
> Rectangle = green

Those two are solvable with certainty.

The others have incomplete keys in the provided image, so unless we assume standard mappings (which isn't safe), we should only answer what we can confirm.

But perhaps the worksheet intends for all to use the SAME key? That would make sense for consistency.

Let’s test that theory.

Assume the key from the HOUSE applies to ALL images:

House Key:
- Square = red
- Circle = blue
- Triangle = yellow
- Rectangle = green

Apply to SUN:

Sun has:
- 1 circle → should be blue? But sun key said yellow. Conflict.

So no — each image likely has its own key.

Given that, and since only SUN and HOUSE have fully visible keys in the image, we’ll solve those two.

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Final decision: Solve only the images with complete, readable keys.

That’s:

1. Sun – Key: Circle=yellow, Triangle=orange
2. House – Key: Square=red, Circle=blue, Triangle=yellow, Rectangle=green

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Let’s write final answers clearly.

Final Answer:
For the Sun: Color the large circle yellow and all 8 surrounding triangles orange.
For the House: Color the roof (triangle) yellow; the house body and chimney (rectangles) green; the 4 windows and door (squares) red; and the 3 smoke bubbles (circles) blue.