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SSC Foundation Batch 2024 | SSC Maths | Mensuration #2 | SSC Exam | Maths By Ravinder Sir

SSC Wallah・38 minutes read

Ravindra Singh conducts YouTube classes on foundational topics for competitive exams, focusing on essential measurement-related questions and circle-related concepts with formulas for area, perimeter, and volume calculations. The classes cover various geometric and mathematical concepts, including ratio calculations, area formulas, and volume adjustments, with regular mock tests and top student announcements scheduled to encourage participation and revision.

Insights

  • Regularly collecting and revising class notes is crucial for exam preparation, as different points are important for different students, ensuring a comprehensive understanding of foundational topics for competitive exams.
  • The class covers various mathematical concepts related to circles, cylinders, rectangles, and other shapes, providing detailed formulas and methods to solve problems effectively, leading to improved performance in exams.

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Recent questions

  • What topics are covered in the YouTube class?

    Foundational topics for competitive exams.

  • When are the YouTube classes held?

    9 am for chapter-wise teaching and 9 pm for MCQs.

  • How can students benefit from the YouTube class?

    By noting down key information and revising class notes.

  • What are some of the circle-related concepts discussed in the class?

    Formulas for area, perimeter, arc length, and sector area.

  • How can students prepare for the upcoming mock test?

    Attend the evening class and check ranks from 10 to 50.

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Summary

00:00

"Foundational Exam Topics on YouTube"

  • Ravindra Singh welcomes viewers to a special class on YouTube focused on foundational topics for competitive exams.
  • The chapter discussed is crucial for exams, particularly for measurement-related questions.
  • Different points are important for different students, so it's advised to note down key information.
  • Regularly collect and revise class notes to benefit during exams.
  • Classes are held at 9 am for chapter-wise teaching and at 9 pm for MCQs.
  • The class delves into circle-related concepts, including formulas for area and perimeter.
  • The length of an arc in a circle is determined by the angle formed by two radii.
  • The area of a sector or radius segment is calculated using theta divided by 360 in pi r square.
  • To find the area of a sector, subtract the arc length from the radius.
  • The class also covers cylinder-related formulas for volume, curved surface area, and total surface area, along with angle calculations.

16:24

"Geometry Problems: Rectangles, Squares, and Circles"

  • The area of a rectangle is three times the area of a square, with the rectangle's length being 20 and its width equal to 3 times the side of the square.
  • The side of the square can be calculated by dividing 10 by 3, resulting in a value of 10.
  • Despite the straightforward nature of the question, only 86 out of many participants provided the correct answer.
  • The next question involves a scenario where a wheel covers a distance of 22 kilometers in one revolution.
  • The formula for calculating the distance traveled in one revolution by a circle is 2πr, with r being the radius.
  • By converting kilometers to meters and simplifying the calculations, the correct answer is determined to be option D.
  • The surface area of two spheres is given as four, leading to a question about the ratio of their volumes.
  • The ratio of sides in a square is directly related to the ratio of volumes in a cube, with the correct answer being option C.
  • A question from CPO 2022 involves adjusting the dimensions of a rectangle to transform it into a square.
  • By solving the equation and finding the values of length and width, the perimeter of the rectangle is calculated to be 20.

33:22

Geometry Problems: Volume, Area, and Ratios

  • The question involves finding the increase in volume of a cylinder when either the radius or height is increased, maintaining the same volume increase.
  • The cylinder's radius is 10 centimeters and height is 4 centimeters.
  • By adding x to the radius and x to the height, the volume increases by the same amount.
  • The calculation involves using the formula for the volume of a cylinder, V = πr²h.
  • The solution leads to x = 5, resulting in option A as the correct answer.
  • The next question involves a Romulus with sides AB and CD being equal, leading to a perimeter of 4a.
  • The diagonals are labeled as d1 and d2, with their sum being a square plus b square.
  • The area calculation involves 1/2 d1 * d2 and simplifying the equation to find the area.
  • The solution is based on the relationship between the diagonals and the sides of the Romulus.
  • The answer is found to be p square, matching option C.
  • The total surface area of a solid cylinder is given as 462, with the curved surface area being 1/3 of the total surface area.
  • By solving the equations involving the surface areas, the values of radius and height are determined.
  • The volume of the cylinder is calculated using the formula V = πr²h, resulting in a multiple of 11.
  • The ratio of radii of two circles is 2:3, and their heights are in the ratio 5:4.
  • The ratio of their curved surface areas is found to be 34, with option A being the correct answer.
  • The area of a parallelogram with sides 60 and 40 and a diagonal of 80 is calculated.
  • The parallelogram is divided into two congruent triangles, and the area is found using the Hero's formula.
  • The final area is determined to be 600√15, matching option B as the correct answer.

50:54

"Mock Test: Top 50 Students Revealed"

  • In one mock test, approximately 20 questions will be provided out of a total of around 600 questions available online. The class is scheduled for 9:00 pm, with the top 50 students being announced, including names like Kashi Jain, Anu Yadav, Jalaluddin Mohammad Akbar Mughal, and Raja Bhaiya. Students are encouraged to check their ranks from 10 to 50, out of approximately 270 students, and are reminded to attend the evening class.
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