Long description: fig2

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A diagram of a right-angled triangle with labeled side lengths and angles, accompanied by a trigonometric calculation.

Alt text: A diagram of a right-angled triangle with labeled side lengths and angles, accompanied by a trigonometric calculation.

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  • The image displays a right-angled triangle with the hypotenuse labeled "\(210\) millimeters".
  • One acute angle within the triangle is marked as "\(40\) degrees".
  • The side opposite the right angle, which is labeled "\(x_1\)", is positioned vertically, suggesting it is one of the legs of the triangle.
  • Below the triangle, there is a mathematical equation derived from trigonometry: \(\cos(40^\circ) = \frac{x_1}{0.210}\).
  • The calculation is followed by the text "hence", indicating the result of the equation is "\(x_1 = 161\) millimeters".

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