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Use cosine rule to find the length of BD then use this with the sine rule to find length AD, will be more obvious with the diagram on the whiteboard.

Let's call the length of the third edge "Y" so we have edges of 7cm, 5cm and Ycm.There are 6 faces but opposite faces are the same, so there are 3 pairs of faces which are 5cm by 7cm, 5cm by Ycm...

At GCSE, one would need to know two versions of the past tense, the passé composé and the imparfait. The P.C. is used to explain events that happened just once and can be in the near or ...

The 2 key formal features of Frankenstein are the use of epistolary form and an embedded or framed narrative.
A novel written in epistolary form develops the narrative t...

5 = 5(cos(x)^2 + sin(x)^2) = 5cos(x)^2 + 5sin(x)^2=> 5 - 5cos(x)^2 = 5sin(x)^2=> sin(x)^2 + 5 - 5cos(x)^2 = 6sin(x)^2=> sin(x)^2 - 5cos(x)^2 = 6sin(x)^2 - 5