VC2M7SP04 Official strand: Space

Design a shape-sorting algorithm

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Use ordered decisions and explain why the classification is consistent.

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A triangle sorter first asks whether all 3 sides are equal. A triangle has sides 4, 4, 4. Which branch should it take?

ANO: exactly two sides are equal BYES: all three sides are equal CNO: no sides are equal DReject it because all triangles need unequal sides

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Answer: YES: all three sides are equal

Compare all three side lengths.
All match, so the first YES branch applies.

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Curriculum reference

Victorian Curriculum F–10 Version 2.0

Pi Leo practice scope

Use ordered decisions and explain why the classification is consistent.

Read the official VCAA curriculum description (VC2M7SP04)

These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.

Activities to practise beyond the quiz

Supported by the guided activity; selecting an MCQ does not demonstrate this action.

VC2M7SP04-C01Read the exact attribute being tested: number of sides, equal sides or angle sizes. A YES/NO decision uses the supplied facts; how a sketch happens to look is not enough.
VC2M7SP04-C02A regular polygon needs equal sides and equal angles. A rectangle needs four right angles; a square also has four equal sides. Follow every branch in order, and decide whether the output classes may overlap.
VC2M7SP04-C03Use a counterexample to test a proposed rule. A non-square rhombus shows that four equal sides alone do not guarantee a square. If the output must distinguish equilateral triangles from other isosceles triangles, test the more specific condition first.
VC2M7SP04-C04Creating, conducting or using the described practical or digital activity; selecting an MCQ answer does not demonstrate this action.

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Subskills

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Descriptor-derived subskills

D01
Follow a shape decisionRead the exact attribute being tested: number of sides, equal sides or angle sizes. A YES/NO decision uses the supplied facts; how a sketch happens to look is not enough.
D02
Link several testsA regular polygon needs equal sides and equal angles. A rectangle needs four right angles; a square also has four equal sides. Follow every branch in order, and decide whether the output classes may overlap.
D03
Debug a classification ruleUse a counterexample to test a proposed rule. A non-square rhombus shows that four equal sides alone do not guarantee a square. If the output must distinguish equilateral triangles from other isosceles triangles, test the more specific condition first.