Triangle Angles
Explore shapes
Try exterior angles
Tap or click
What is this activity?
Use the marked angles to find the missing angle in a triangle. Add exterior-angle questions when you are ready.
Let’s give it a try!
送信中です
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How to play
- Click the green flag to start.
- Use the angles in the diagram to calculate the missing angle.
- Tap the answer area and enter your answer.
The 外角も求める setting adds exterior-angle questions. 外角 means “exterior angle”. The original setting and answer prompt remain in Japanese.
For families and teachers
The interior angles of a triangle add to 180°. An exterior angle and its neighbouring interior angle also add to 180°.
This English guide uses the original Chicodori Scratch project. Some labels remain in Japanese. You can explore and remix the project on Scratch.