Math formulas

• Exterior angle of a polygon = 360°
• Profit = Selling Price (SP) - Cost Price (CP)
• Loss = CP - SP
• Loss = CP - SP = Discount + (Profit - SP)
• Profit percentage = (Profit / CP) x 100%
• Discount = Discount x 100%
• Simple interest formula: P x R x T
• Compound interest formula: A = P(1 + r/n)^nt
• Area of a square = side x side
• Area of a trapezium = 1/2 x (sum of parallel sides) x height
• Area of a parallelogram = base x height
• Area of a rhombus = 1/2 x (diagonal 1 x diagonal 2)
• Circumference of a circle = 2 x π x radius
• Area of a triangle = 1/2 x base x height
• Identity: (a + b)^2 = a^2 + 2ab + b^2
• Volume of a cube = side x side x side
• Total Surface Area (TSA) of a cube = 6 x side^2
• Volume of a cuboid = length x breadth x height
• Volume of a cylinder = π x radius^2 x height
• Total Surface Area (TSA) of a cylinder = 2πrh + 2πr^2
• Area of a rectangle = length x breadth
• Area of a cylinder = 2πrh + 2πr^2
• Perimeter of a parallelogram = 2 x (side a + side b)
• Perimeter of a triangle = side a + side b + side c
• Perimeter of a rectangle = 2(length + breadth)
• Perimeter of a square = 4 x side
• Profit = SP - CP
• Survival after the tsunami

  1. Meghna floated in the sea for two days holding on to a wooden door and was brought to the shore by a wave

  2. Almas climbed onto a log of wood and fainted. She woke up in a hospital
• When he felt the earthquake

  Ignesious did not think about the tsunami, he only thought about the tremors
• Tilly's parents could have reacted to her behavior

  They could have tried to calm her down, preventing being washed away by the tsunami waves
• It is scientifically proven that animals can hear the approaching natural disturbances
• Animals run away to safer places before disasters due to their ability to sense the coming danger
• Both Meghna's and Almas's families had washed away in the tsunami but they were the only members from their respective families who had survived
• Both Meghna and Almas were traumatised after the incident
• Animals can hear the approaching natural disturbances as they can hear sounds with low frequency which we can't
• Animals have a more acute sense of hearing which helps them sense the coming disaster much before human beings
• Tilly's award was to be shared


  She should share it with her geography teacher who made her aware of the tsunami, helping her save lives
• The experience as an Everester provided the writer with the inspiration to face life's ordeals determinedly. It taught him that the conquest of the internal
• 'The poetry of earth' is not made of words, but of the song and rhythm produced by grasshoppers and crickets in various seasons
• Climbing a high peak brings a sense of fulfillment. It is the satisfaction of a deep urge to rise above one's surroundings and the eternal love for adventure that are found in human beings