EM-1376

Cosine rule

E Math · Secondary 3 · Medium · Cosine rule

In

\triangle ABC

,

a=7

,

b=10

and the included angle

C=60^\circ

. Using the cosine rule, find the length of side

c

opposite angle

C

, correct to 1 decimal place.

8.9 units
5.4 units
13.3 units
11.9 units

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