Construct it
The constructions this book asks for, with a ruler, a compass and a sharp pencil. Pick a set of values, construct it on paper one step at a time, and check each step against the drawing. Every drawing is at true size.
- Dividing a line segment Into equal parts, or in a given ratio Unit 13 · Triangle
- Angles with a compass 60°, 120° and 90°, and 30° and 45° by bisecting Unit 15 · Construction
- More angles with a compass 15°, 75°, 105°, 135° and 150°, each by bisecting Unit 15 · Construction
- Bisecting a line segment Its midpoint, and the perpendicular through it Unit 15 · Construction
- A parallel line through a point Copy the angle: equal alternate angles Unit 15 · Construction
- A quadrilateral from five measures Sides, diagonals and angles: a triangle at a time Unit 15 · Construction
- A trapezium Two parallel sides: sides, a diagonal and angles Unit 15 · Construction
- A rhombus From its diagonals, or a side with an angle or a diagonal Unit 15 · Construction
- The circle through three corners A triangle’s circumcircle, from the bisectors of its sides Unit 16 · Circle
- The circle inside a triangle A triangle’s incircle, from the bisectors of its angles Unit 16 · Circle