Hello i need help with questions 3 and 4. please and thank u.

  3.  28 feet

  4.  15

Step-by-step explanation:

3. Using r for the radius of the pond, we have a right triangle with sides r and 45 ft, and hypotenuse (25+r) feet. The Pythagorean theorem tells us ...

  (25+r)^2 = 45^2 +r^2

  625 +50r +r^2 = 2025 +r^2

  50r = 1400 . . . . . subtract 625+r^2

  r = 28 . . . . . . . . . divide by 50

The radius of the pond is 28 feet.

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4. The marks on the chord segments tell us the chords are the same length. Same-length chords are the same distance from the center of the circle:

  x = 15

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