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Sagot :
The shadow of the building reaches the ground and forms with the ground and the building itself a right triangle, i.e., a triangle with an angle of 90°.
In right triangles, the Pythagora's Theorem is satisfied.
If a and b are the shorter legs of a right triangle, and c is the length of the longer side (the hypotenuse), then:
[tex]a^2+b^2=c^2[/tex]Let's call a to the height of the building, b to the length of the shadow (the horizontal distance from the base of the building to the tip of the shadow), and c to the total length of the shadow from the top of the building right to the ground.
We need to find the value of b. Solving for b:
[tex]b=\sqrt[]{c^2-a^2}[/tex]
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