IGCSE›Cambridge IGCSE Maths›Mind mapsGeometry ToolkitCambridge IGCSE Maths: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsAngle typesAcute is under 90°Right angle is exactly 90°Obtuse is between 90° and 180°Reflex is between 180° and 360°Lines and shapesPerpendicular lines meet at 90°Parallel lines never meetSimilar: equal angles, proportional sidesCongruent: identical shape and sizeTrianglesEquilateral: three equal sides, 60° anglesIsosceles: two equal sides and base anglesScalene: all sides and angles differentGeometry toolkitkey vocabulary90°180°360°QuadrilateralsRhombus: four equal sidesParallelogram: two pairs of parallel sidesKite: two pairs of adjacent equal sidesTrapezium: exactly one parallel pairCirclesChord joins two points on the circumferenceTangent touches at exactly one pointSector: two radii and an arcSegment: a chord and an arcExam tipsUse a ruler and protractor, never freehandSketch a labelled diagram from a worded description