Area of rectangle = length× width S=ab
Circumference of a square = side length ×4 C=4a
Area of a square = side length × side length s = a× a.
Area of triangle = base × height ÷2. S= a×h÷2。
Area of parallelogram = base× height S= a×h
Trapezoidal area = (upper bottom+lower bottom) × height ÷ 2s = (a+b) h ÷ 2.
Diameter = radius ×2 d=2r Radius = diameter ÷2 r= d÷2.
Circumference = π× diameter = π× radius× 2c = π d = 2π r
Area of circle = π× radius× radius
Sum of internal angles: sum of internal angles of triangle = 180 degrees.
Cuboid volume = length× width× height formula: V=abh
Volume of cuboid (or cube) = bottom area × height formula: V=abh.
Volume of cube = side length × side length × side length formula: V=aaa.
Circumference = diameter × π formula: L = π d = 2π r
Area of circle = radius × radius× π formula: s = π R2.
Surface (side) area of cylinder: The surface (side) area of cylinder is equal to the perimeter of bottom multiplied by height. Formula: s = ch = π dh = 2π rh.
Surface area of a cylinder: the surface area of a cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends. Formula: S=ch+2s=ch+2πr2.
Volume of cylinder: the volume of cylinder is equal to the bottom area multiplied by the height. Formula: V=Sh
Volume of cone = 1/3 bottom× product height. Formula: V= 1/3Sh.