Question

help ༎ຶ‿༎ຶ i dont get it​

Answer 1

Answer:

Step-by-step explanation:

You know the lengths of two sides and the angle between them, so use the Law of Cosines to find the third side.

x^2 = 10.5^2+ 5.4^2 -2(10.5)(5.4)cos20°

x ≈ 5.73 units

Answer 2

Answer:

$\underline{ \boxed{x = 5.7}}$

Step-by-step explanation:

$its \: simple \: and \: easy \ \: : \: if \: you \: apply \: the \: cosine \: rule \to \\ {x}^{2} = {(10.5)}^{2} + {(5.4)}^{2} - 2(10.5)(5.4) \cos(20) \\ {x}^{2} =( 110.25 +29.16 ) - (113.4)( \cos(20)) \\ {x}^{2} = 139.41 - 106.5611432 \\ {x}^{2} = 32.8488568 \\ x = \sqrt{32.8488568} \\ x = 5.7313922218 \\ \boxed{x = 5.7}$