Circumference:
The circumference of a rectangle = (length+width) × 2 = 2 (a+b) = (a+b) × 2.
Circumference of a square = side length ×4 = 4a
Circumference = π× diameter =πd =π× radius× 2 = 2π r
Region:
Area of rectangle = length× width S = ab
Area of a square = side length × side length S = a?
Area of triangle = base × height ÷2 S=ah÷2.
Area of parallelogram = base × height S=ah
Trapezoidal area = (upper bottom+lower bottom) × height ÷2 S=(a+b)h÷2.
Diameter = radius× 2d = 2r
Radius = diameter ÷2 r=d÷2
Area of circle = π× radius× radius
Area of triangle = base × height ÷2 S=a×h÷2.
Area of a square = side length × side length s = a× a.
Area of rectangle = length× width S=a×b
Area of parallelogram = base× height S=a×h
Trapezoidal area = (upper bottom+lower bottom) × height ÷2 S=(a+b)h÷2.
Sum of internal angles: sum of internal angles of triangle = 180 degrees.
Volume of cuboid = length× width× height V=abc
Volume of cuboid (or cube) = bottom area × height V=Sh
Volume of cube = side length × side length × side length V=aaa
Area of circle = radius× radius× π s = π R2
Lateral area of a cylinder: the lateral area of a cylinder is equal to the perimeter of the bottom multiplied by the height. S=ch=πdh=2πrh
Surface area of cylinder: the surface area of cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends. S=ch+2s=ch+2πr2
Volume of cylinder: The volume of cylinder is equal to the bottom area multiplied by the height. V=Sh
The volume of the cone = 1/3 bottom area × height. V= 1/3Sh .
Conversion of common units of measurement:
1, unit of length
Metric system: meters (m), centimeters (cm) and millimeters (mm). L m = 100 cm = 1000 mm English system: yards (yd), feet (ft) and inches (in). 1 yard = 3 feet, 1 foot = 12 inch conversion: 1 yard = 0.9 144 meter, 1 foot = 0.3048 meter, l inch = 2.54 cm =
2. Mass (weight) unit
Metric system: tons (t), kilograms (kg) and grams (g). 1 ton = 1000 kg, 1 kg = 1000 g, 1 g =/0/000 mg British system: pounds (lb), ounces (oz), green (gr
1 lb = 1 oz = 7000 greens, 1 oz = 437.5 greens conversion: 1 lb = 0.4536kg = 453.6g, 1 oz = 28.35g,/kloc. 1 kg = 2.2046 pounds, 1 g = 15.432 green, 1 kg = 35.27 ounces.
3. Area unit
Metric system: square meter (m2), square centimeter (cmm2) and square millimeter (mmm2). 1m2 = 10000m2), 1cm2 = 100m2 English: code? (yd？ ) conversion: 1 m? = 1. 196 code? .
4. Units of force
Metric system: Newton (N), Centennial Newton (cN), Dan. 1 Newton (N)= 100 centigrade Newton (cN), 1 kilogram force (kgf)= 1000 gram force (gf), 1 Dan = 10 Newton (n
English system: pound force (lbf), ounce force (oz) conversion: 1 kg force (kgf)=9.807 newtons (n), 1 gram force (gf)=0.9807 centinewtons (cN), 1 kg force (kgf)