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Reasoning about quadrilaterals
Use congruent triangles and parallel-line angle facts to prove properties of parallelograms, rectangles and rhombuses, then use those properties to solve problems.
⏱ 20 min❓ 10 questions
What you'll be able to do
- ✔I can use congruent triangles to explain why the diagonals of a parallelogram bisect each other
- ✔I can state and use the diagonal properties of rectangles, rhombuses, squares and kites
- ✔I can use quadrilateral properties to find unknown lengths and angles, including with algebra
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
10 questions and 1 quick teaching card, including:
- 🔢Number answer — Work out the answer and type the number.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9M8SP02