EM-3080

Cosine rule

E Math · Secondary 4 · Medium · Cosine rule

In a triangle

ABC

,

|AB| = 7

cm,

|AC| = 10

cm and

|BC| = 12

cm. Find the size of angle

ABC

to 1 decimal place.

88.0°
56.4°
34.0°
92.0°

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