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Question

What is the centroid on the line of symmetry from the center distance of a quarter circle, if the radius is R?

The correct answer is
$4R/3\pi$

To find the centroid's distance from the center along the line of symmetry of a quarter circle, follow these steps:

Centroid of a Quarter Circle

Consider a quarter circle with radius R, centered at the origin (0,0) and lying in the first quadrant. The coordinates of its centroid $(x_c, y_c)$ are given by the standard formula:

$ x_c = \frac{4R}{3\pi} $

$ y_c = \frac{4R}{3\pi} $

Line of Symmetry and Distance

The line of symmetry for this quarter circle, passing through the center (origin) and the centroid, is the line where $x = y$.

The question asks for the distance of the centroid from the center *along this line of symmetry*. Since the centroid coordinates are equal ($x_c = y_c$), the centroid lies directly on the line $y=x$.

Therefore, the distance from the center (0,0) to the centroid $(\frac{4R}{3\pi}, \frac{4R}{3\pi})$ along the line $y=x$ is simply the value of the x-coordinate (or the y-coordinate).

Final Calculation

Distance = $ x_c = y_c = \frac{4R}{3\pi} $

Thus, the centroid on the line of symmetry from the center distance of a quarter circle is $ \frac{4R}{3\pi} $. This corresponds to Option D.

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Important Questions from Centroid

  1. If the centroid of a triangle formed by (7, x), (y, -6) and (9, 10) is (6, 3), then the values of x and y are respectively

  2. What is the area of the triangle formed by these lines?

  3. If \(\vec a, \vec b, \vec c\) , are the position vectors of the vertices A, B, C respectively of a triangle ABC and G is the centroid of the triangle, then what is \(\overrightarrow{AG}\) equal to ? .

  4. In Δ ABC, the coordinates of B are (0, 0), AB = 2, ∠ABC = π/3 and the middle point of BC has the coordinates (2, 0). The centroid of triangle is:

  5. Consider the following statements regarding the centre of gravity and centroid:

    1. Centroid of an area does not lie on the axis of symmetry if it exits.

    2. Centre of gravity of a body is a point through which the resultant gravitational force acts for any orientation of the body.

    3. Centroid is a point in a line plane area volume such that the moment of area about any axis through that point is zero.

    Which of the above statements are correct?

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