Lighthouse

Author:R. Shawver, Sham

Here is a classic question, given the height of a lighthouse (PQ) , the bearings of two ships and the respective angle of depression, can you find the distance between the two ships (ST)?

New Resources

希尔伯特曲线
Linear Equation Graphs: Thin Slice
Slope Illustrator (2)
Perpendicular Lines: Quick Exploration
繪畫垂直線

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circumcentre d'un triangle.
Approximating and Guessing Derivative
w tranformations
Flower 5 petals/circles RO Mara
Unitary_method

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Translation
Mode
Surface
Equilateral Triangles
Circumcircle or Circumscribed Circle