Question

Find the length of a.

Answer 1

The answer is 22.2 is correct

Answer 2

Answer:

22.2

Step-by-step explanation:

Using cosine rule,

$a^{2} = 12^{2} + 15^{2} -2(12)(15)cos110$°

$a = \sqrt{12^{2} +15^{2}-2(12)(15)cos110 }$

$a = 22.2 (3 sf)$