(a ± b)2 = a2 ± 2ab + b2
(a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca)
(a + b + c + d)2 = a2 + b2 + c2 + d2 + 2(ab + ac + ad + bc + bd + cd)
Perimeter ( ചുറ്റളവ് )
Perimeter of a square: P=4a
a: length of one side
Perimeter of a rectangle: P=2(l+w)
l: length
w: width
Perimeter of a triangle: P=a+b+c
a, b, and c: lengths of the 3 sides
Area of a square: A=a2
a: length of one side
Area of a rectangle: A=wl
l: length
w: width
Area of a triangle: A=(b × h)/2
b: length of the base
h: length of the height
Area of a trapezoid: A=(b1 + b2) × h/2
b1 and b2: parallel sides or the bases
h: length of the height
Volume of a cube: V=a3
a: length of one side
Volume of a box: v=l × w × h
l: length
w: width
h: height
Volume of a sphere: v=(4/3) × π × r3
π: 3.14
r: radius of sphere
Volume of a cylinder: V=πr2h
π: 3.14
r: radius of the circle of the base
h: height of the cylinder