Math Problem Statement

The figure shows two circles with the same center O. ABCD and AEO are straight lines. M is the mid-point of AD. It is given that OE = 25 cm, AE = 14 cm, and AB = 16 cm. Find OM.

Solution

The problem involves two concentric circles with center OO, and the following information is given:

  • OE=25cmOE = 25 \, \text{cm} (the radius of the inner circle).
  • AE=14cmAE = 14 \, \text{cm}.
  • AB=16cmAB = 16 \, \text{cm}, so BE=ABAE=1614=2cmBE = AB - AE = 16 - 14 = 2 \, \text{cm}.
  • MM is the midpoint of ADAD.

We need to find the length of OMOM.

Approach:

  1. Since MM is the midpoint of ADAD, and AB=16cmAB = 16 \, \text{cm}, it follows that AM=MD=AB2=8cmAM = MD = \frac{AB}{2} = 8 \, \text{cm}.

  2. Using the right triangle OEMOEM, we can apply the Pythagorean theorem to find OMOM.

  • In triangle OEMOEM, OE=25cmOE = 25 \, \text{cm} and EM=AEAM=148=6cmEM = AE - AM = 14 - 8 = 6 \, \text{cm}.

Now, applying the Pythagorean theorem:

OM=OE2EM2OM = \sqrt{OE^2 - EM^2}

Let me calculate OMOM for you.The length of OMOM is approximately 24.27cm24.27 \, \text{cm}.

Would you like more details on this, or do you have any questions?

Here are five related questions to deepen understanding:

  1. How would the solution change if AEAE and ABAB were different values?
  2. Can the same method be applied if the circles were not concentric?
  3. What geometric properties are essential in solving problems involving concentric circles?
  4. How can the Pythagorean theorem be applied to find other distances in the diagram?
  5. If OO were not the center, how would the approach change?

Tip: Always verify that you're using the correct sides of a right triangle when applying the Pythagorean theorem, ensuring that you correctly identify the hypotenuse.

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Math Problem Analysis

Mathematical Concepts

Geometry
Pythagorean Theorem
Concentric Circles

Formulas

Pythagorean theorem: a^2 + b^2 = c^2

Theorems

Pythagorean theorem

Suitable Grade Level

Grades 8-10