General Knowledge

Mensuration formulas
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
≡≡≡≡≡≡≡
Two dimensional rectangle / square / time :::
► class
• Area = Side²
• Parameter = 4 x arm
• Diagonal = side √2
.
►Iight
• Area = length x width
• Parameter = 2 (length + width)
• diagonal = √ (length² + width = 2)
.
►Act
• Area = πr² (interior)
• Perimeter = 2πr (exterior)
.
☞ three dimensional rectangle / square / time :::
► Dug
• Volume = Side (internal part)
• Curved = 6 side² (outer part)
• Diagonal = side 3
.
►Hard
• Volume = Length x Width x height
(Internal part)
• Curve = 2 (lb + bh + hl) (exterior part)
• Diagonal = √ (length² + width = +
Height²)
.
►Go
• Curved = 3πr² (exterior)
• Volume = (4/3) πr³ (interior)
.
Roller
Curve = 2πrh (exterior part)
Full page = 2πr (h + r)
Volume = πr²h (interior)
.
►Singu
• Volume = (1/3) πr²h
• Area = πr (r + s)
.
☞ Triangle :::
►Samahu: - All sides are equal
• Area = (√3) / 4 x square²
.
►Somewhere: - any two sides
equal
Area = 1 x x base x height
.
► Inheritance: - All sides are uneven
• Perimeter = (a + b + c) / 2
• Area = √ [s-a} (s-c)]
.
☞ Quadrilateral :::
► Parameter: - All sides are equal and one
Second parallel
• Area = 1/2 (diagonal 1 x diagonal 2)
.
►Somplete Sumo: -
Any two side parallel
• Area = 1/2 (parallel sides
Yoga) x height
.
► Parallel Sampler: - Any two sides
equal
• Area = Base x height