Being able to identify which formula to use, sine or cosine, and when, is necessary to answer questions on this topic successfully. Check you are confident in how to use the sine and cosine rules.
The shape ABCDEFGH is a cuboid. AB is 6 cm, BG is 3 cm and FG is 2 cm. The diagonal AF is 7 cm. The plane ABCD is the base of the cuboid. The line FC and the plane ...
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