Area of triangle = base × height ÷2.
formula
S=
a×h \u 2
Area of a square = side length × side length
formula
S=
a×a
Area of rectangle = length × width
formula
S=
a×b
Area of parallelogram = base × height
formula
S=
a×h
Trapezoidal area = (upper bottom+lower bottom) × height ÷2
formula
S=(a+b)h÷2
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 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. 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