🏛️ Geometry & Shapes Misconceptions
Common mistakes in geometry & shapes
Confusing parallel with collinear H
"The Parallel Pitfall"
Geometry & ShapesIgnoring direction (negative signs)
"The One-Way Street"
Geometry & ShapesWriting column vectors as fractions
"The Fraction Habit"
Geometry & ShapesConfusing "bearing of A from B" with "bearing of B from A"
"The From Confusion"
Geometry & ShapesConfusing opposite and adjacent sides
"The O-A Swap"
Geometry & ShapesFinding $c^2$ instead of $c$
"The Forgotten Root"
Geometry & ShapesForgetting to include radii in sector perimeter
"The Missing Radii"
Geometry & ShapesHalving instead of doubling for angle at centre H
"The Half-Double Confusion"
Geometry & ShapesIncomplete transformation description
"The Missing Detail"
Geometry & ShapesUsing 180° as the sum for all polygons
"The Triangle Default"
Geometry & ShapesUsing diameter instead of radius in circle formulas
"The D-R Disaster"
Geometry & ShapesUsing length scale factor for area
"The Area Scale Slip"
Geometry & ShapesUsing the wrong trigonometric rule H
"The Rule Mix-Up"
Geometry & ShapesAdding adjacent instead of opposite angles in cyclic quadrilateral H
"The Adjacent Angle Error"
Geometry & ShapesAdding when finding a shorter side
"The Plus-Minus Mixup"
Geometry & ShapesCalculator set to radians instead of degrees
"The Mode Mishap"
Geometry & ShapesConfusing interior and exterior angle formulas
"The Inside-Out Error"
Geometry & ShapesGetting the angle fraction upside down
"The Fraction Flip"
Geometry & ShapesMatching wrong corresponding sides
"The Side Mismatch"
Geometry & ShapesMeasuring anticlockwise instead of clockwise
"The Wrong Direction"
Geometry & ShapesSign error in the cosine rule H
"The Sign Slip"
Geometry & ShapesUsing slant height instead of perpendicular height
"The Slant Slip"
Geometry & ShapesWrong signs in translation vectors
"The Vector Sign Slip"
Geometry & ShapesEnlarging from wrong point
"The Centre Confusion"
Geometry & ShapesForgetting tangent-radius is 90° H
"The Right Angle Oversight"
Geometry & ShapesForgetting the ½ in triangle area
"The Missing Half"
Geometry & ShapesLabelling the wrong side as the hypotenuse
"The Hypotenuse Hijack"
Geometry & ShapesMixing up alternate and co-interior angles
"The Z and C Confusion"
Geometry & ShapesNot using inverse functions to find angles
"The Inverse Forget"
Geometry & ShapesNot using three figures for bearings
"The Missing Zero"
Geometry & ShapesThinking AAA proves congruence
"The AAA Assumption"
Geometry & ShapesUsing diameter instead of radius in arc/sector formulas
"The D for R Disaster"
Geometry & ShapesUsing the wrong angle in the area formula H
"The Wrong Angle"
Geometry & ShapesConfusing clockwise and anticlockwise
"The Direction Dilemma"
Geometry & ShapesIgnoring the ambiguous case H
"The Missing Answer"
Geometry & ShapesMixing up exact trig values for 30° and 60° H
"The 30-60 Swap"
Geometry & ShapesUsing degree formula with radians or vice versa H
"The Radian Wrangle"
Geometry & Shapes