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Solution 4.2:1f

From Förberedande kurs i matematik 1

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The side adjacent to the angle of 50° is marked ''x'' and the opposite is the side of length 19.
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[[Image:4_2_1_f.gif|center]]
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If we write the tangent for the angle, this gives a relation which contains ''x'' as the only unknown,
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{{Displayed math||<math>\tan 50^{\circ} = \frac{19}{x}\,\textrm{.}</math>}}
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This gives
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{{Displayed math||<math>x=\frac{19}{\tan 50^{\circ }}\quad ({}\approx 15\textrm{.}9)\,\textrm{.}</math>}}

Current revision

The side adjacent to the angle of 50° is marked x and the opposite is the side of length 19.

If we write the tangent for the angle, this gives a relation which contains x as the only unknown,

tan50=x19.

This gives

x=19tan50(15.9).
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