Maths Elementary Shapes part 9 (Questions 1: Angles) CBSE Class 6 Mathematics VI | Summary and Q&A

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January 18, 2017
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Maths Elementary Shapes part 9 (Questions 1: Angles) CBSE Class 6 Mathematics VI

TL;DR

This video explains how to determine the position of a clock's hour hand after a certain rotation, and the direction you will face after a given revolution.

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Key Insights

  • 🔃 A half revolution clockwise brings a clock's hour hand to 6 o'clock, while a half revolution starting at 2 o'clock leads to 8 o'clock.
  • 💁 After rotating the hour hand of a clock by 180 degrees, it forms a straight line, and the remaining rotation determines the final position.
  • ✖️ To calculate the degrees for a specific fraction of a revolution, multiply the fraction by 360 degrees.
  • 🔄 Anti-clockwise rotation refers to the counter-clockwise direction, while clockwise rotation refers to the direction of the clock's movement.
  • ⭕ One full revolution corresponds to 360 degrees, completing a circle.
  • 😀 The direction you will face after a specific revolution depends on the initial direction and the angle of rotation.
  • 🧘 Dividing a circle into quadrants helps visualize different degrees and positions within a revolution.

Transcript

he'll open this video on understanding elementary shapes part 9 is brought to you by example comm know about your thumb exam using the tracker' so based on all that we learned about angles let's try some questions question number one we're in the hands of a clock talk if it starts such 12:00 and makes half a revolution clockwise that means the hand... Read More

Questions & Answers

Q: How can you determine the position of a clock's hour hand after a half revolution in a clockwise direction?

In a clockwise half revolution, the hand of the clock will move from 12 o'clock to 6 o'clock. This is because a full revolution is 360 degrees, so half revolution is 180 degrees, which corresponds to the position 180 degrees clockwise from the starting point.

Q: If the hand of the clock starts at 2 o'clock and makes a half revolution clockwise, where will it stop?

When the hand of the clock starts at 2 o'clock and makes a half revolution clockwise, it will end at 8 o'clock. This is because a half revolution is 180 degrees, and after 180 degrees of clockwise rotation, the hand will be at 8 o'clock.

Q: Which direction will you face if you start facing west and make a 3/4 revolution anti-clockwise?

If you start facing west and make a 3/4 revolution in an anti-clockwise direction, you will end up facing north. This is because a 3/4 revolution is equal to 270 degrees (3 times 90 degrees), which corresponds to the direction opposite to the initial position, resulting in a north-facing direction.

Q: What will be your position after making one full revolution?

After making one full revolution, you will return to your original position. For example, if you start facing south, you will end up facing south again. One full revolution corresponds to 360 degrees, completing a full circle and bringing you back to the starting point.

Summary & Key Takeaways

  • The video demonstrates how to calculate the position of a clock's hour hand after a specific rotation, using the knowledge that one full revolution corresponds to 360 degrees.

  • It explains that a half revolution in a clockwise direction will bring the hand of the clock to 6 o'clock, while a half revolution starting at 2 o'clock will lead to 8 o'clock.

  • The video also illustrates how to determine the direction you will face after a given revolution, such as facing west after a 3/4 revolution in an anti-clockwise direction.

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