--- 2-dimensional shapes ---
Circle
Ellipse
Parallelogram, Rhombus
Rectangle, Square
Regular polygon
Sector
Trapezium / Trapezoid (US)
Triangle
Triangle (Heron)
--- 3-dimensional shapes ---
Cone
Cube
Cylinder
Rectangular cuboid
Sphere
Tetrahedron (regular)
$$A= \pi \times r^{2} \times \frac{\theta ^{\circ}}{360^{\circ}}$$
cables
centimetres (cm)
decimetres (dm)
feet (ft)
inches (in)
kilometres (km)
metres (m)
miles (mi)
millimetres (mm)
nautical miles (nmi)
yards (yd)
寸 sun
尺 shaku
1/8 rotation (45° or π/4 rad)
Babylonian angle unit (60° or π/3 rad)
degree of arc
full rotation (360°)
grad / gradian / gon
half rotation (180° or π rad)
hour angle
mil (NATO)
mil (Soviet Union)
mil (Sweden)
milliradian
minute of arc (arcmin)
point (π/16 rad)
radian
right angle (90° or π/2 rad)
second of arc (arcsec)
Ares (a)
acres
hectares (ha)
square centimetre (cm²)
square feet (ft²)
square inches (sq in)
square kilometres (km²)
square metres (m²)
square miles
square millimetre (mm²)
square yards (yd²)
坪 tsubo
歩 bu
畳 jō
