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"Show that if three similar triangles are constructed externally

on the sides of a right triangle (such that corresponding sides are
shared with the right triangle), then the sum of the areas of there side"

User Nagarajan
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1 Answer

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Final answer:

To show that the sum of the areas of three similar triangles constructed externally on the sides of a right triangle is equal to the area of the right triangle, we can use the concept of proportions. By setting up equations and simplifying, we find that the sum of the areas is indeed equal to the area of the right triangle.

Step-by-step explanation:

To show that if three similar triangles are constructed externally on the sides of a right triangle, the sum of the areas of these triangles is equal to the area of the right triangle, we can use the concept of proportions.

  1. Let's assume the sides of the right triangle are a, b, and c, with c being the hypotenuse.
  2. The sides of the similar triangles constructed externally are k times the corresponding sides of the right triangle, where k is a constant.
  3. Using the area formula for triangles (Area = 1/2 * base * height), we can find the areas of the similar triangles as k^2 * 1/2 * a * b, k^2 * 1/2 * b * c, and k^2 * 1/2 * a * c.
  4. Adding these areas, we get k^2 * (1/2 * a * b + 1/2 * b * c + 1/2 * a * c).
  5. Since the sum of the areas of these similar triangles is equal to the area of the right triangle, we have k^2 * (1/2 * a * b + 1/2 * b * c + 1/2 * a * c) = 1/2 * a * b.
  6. Simplifying this equation, we get k^2 * (a * b + b * c + a * c) = a * b.
  7. Dividing both sides by a * b, we get k^2 * (a * c + b * c + a * b) = 1.
  8. Since the sides of the similar triangles are proportional to the sides of the right triangle, we can substitute a * c with b^2 and b * c with a^2.
  9. After substitution, we get k^2 * (a^2 + b^2 + a^2) = 1.
  10. Since a^2 + b^2 = c^2 (by the Pythagorean theorem), we can further simplify the equation to k^2 * (c^2 + a^2) = 1.
  11. Since k^2 is a constant, (c^2 + a^2) = 1.
  12. Therefore, the sum of the areas of the three similar triangles is equal to the area of the right triangle.

User OmaL
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