What does the 0.7071... mean? It is the ratio of the side lengths, so the Opposite is about 0.7071 times as long as the Hypotenuse.
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We can now put 0.7071... in place of sin(45°):
0.7071... = OppositeHypotenuse
And we also know the hypotenuse is 20:
0.7071... = Opposite20
To solve, first multiply both sides by 20:
20 × 0.7071... = Opposite
Opposite = 14.14m (to 2 decimals
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