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Question

A $2\text{ m}$ long ladder is to reach a wall of height $1.75\text{ m}$. The largest possible horizontal distance of the ladder from the wall could be

The correct answer is
slightly less than $1\text{ m}$

Ladder Problem: Applying Pythagorean Theorem

This problem involves a right-angled triangle formed by the ladder, the wall, and the ground. We can use the Pythagorean theorem to find the unknown horizontal distance.

  • Let the length of the ladder be the hypotenuse, $L = 2\text{ m}$.
  • Let the height of the wall be one leg, $H = 1.75\text{ m}$.
  • Let the horizontal distance from the wall be the other leg, $D$.

Calculating Horizontal Distance

According to the Pythagorean theorem: $D^2 + H^2 = L^2$

We need to find $D$. Rearranging the formula:

$D^2 = L^2 - H^2$

Substitute the given values:

$D^2 = (2)^2 - (1.75)^2$

$D^2 = 4 - 3.0625$

$D^2 = 0.9375$

Now, take the square root to find $D$:

$D = \sqrt{0.9375}$

Determining the Correct Option

We need to estimate the value of $\sqrt{0.9375}$.

  • We know that $\sqrt{1} = 1$.
  • Since $0.9375$ is less than $1$, its square root must also be less than $1$.
  • Calculating the value gives $D \approx 0.9682\text{ m}$.

Therefore, the largest possible horizontal distance $D$ is approximately $0.9682\text{ m}$, which is slightly less than $1\text{ m}$.

The correct option is the one describing a distance slightly less than $1\text{ m}$.

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Important Questions from Geometry (Notes)

  1. Which of the following is not true for a parallelogram?
  2. A 6 cm long chord of a circle is at a distance of 4 cm from the centre of the circle. Find the distance of 8 cm long chord of the same circle from the centre.
  3. The length of major axis and coordinate of vertices for the ellipse $3x^2 + 2y^2 = 6$ respectively are:
  4. If the line through (3, y) and (2, 7) is parallel to the line through (-1, 4) and (0,6), then the value of y is:
  5. The points (K, 2 – 2K), (-K +1,2K) and (-4-K, 6-2K) are collinear if:
    (A) K = $\frac{1}{2}$
    (B) K = $-\frac{1}{2}$
    (C) K = $\frac{3}{2}$
    (D) K = -1
    (E) K = 1
    Choose the correct answer from the options given below:
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