Answer:
AB = 17 m, AC ≈ 19.2 m
Explanation:
Drawing a line from A to the base creates a right triangle
with legs 8 and (25 - 10 ) = 15
Using Pythagoras' identity in the right triangle.
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
AB² = 15² + 8² = 225 + 64 = 289 ( take the square root of both sides )
AB =
= 17 m
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Using Pythagoras' identity i right triangle ABC
AC² = AB² + BC² = 17² + 9² = 289 + 81 = 370 ( take square root of both sides )
AC =
≈ 19.2 m ( to 1 dec. place )