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What scientific photos are hard to believe but are indeed real? - Quora

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**Pythagoras Theorem** (Formula, Proof and Examples)

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Sniper - Wikipedia

A sniper is a military/paramilitary marksman who engages targets from positions
of concealment or at **distances** exceeding the target's detection capabilities.

For more information, see Sniper - Wikipedia

Step 1: Make a figure from the given information

Step 2: Finding the distance between the position A and tower C

Given that

Parallax angle \theta = 40\degree

Distance AB = 100 m

From the figure

\triangle ABC is a right triangle

Trigonometric ratio \tan \theta = \frac{AB}{AC}

Distance between the position A and tower C = AC

AC = \frac{AB}{\tan \theta }

AC = \frac{100}{\tan 40\degree}

AC = \frac{100}{0.8391} = 119 m

Hence, distance between the position A and tower C, AC = 119 m