Properties of triangles and quadrilaterals

Named shapes carry guaranteed facts: a rhombus has four equal sides, a parallelogram has equal opposite angles, an isosceles triangle has two equal base angles. Recognising the name hands you the facts; assuming facts the name does not guarantee is the trap.

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LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Practice — 4-point ladder2 problems. Three in a row finishes it.0/3 in a row · 0/2 solved
Practice — 5-point ladderNo problems written at this tier yet.Nothing written at this tier yet
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

GEO-05Angles on lines, in triangles, in polygons

Opens up

Nothing yet. No other skill in the Atlas lists this one as a prerequisite.

In official papers

No indexed official paper question has been tagged with GEO-06 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.

See the papers indexed so far

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