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NEED some Help ASAP Plz

NEED some Help ASAP Plz-example-1
User JaPyR
by
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1 Answer

5 votes

Answer:

Option 2

Explanation:

Using cosine rule for this triangle

=>
a^2= b^2+c^2-2bc(Cos A)

Where b = 2, c = 1 and A = 25

=>
a^2 = 2^2+1^2 -2(2)(1)(Cos 25)

=>
a^2 = 4+1 - 4(0.906)

=>
a^2 = 5 - 3.6

=>
a^2 = 1.4

Taking sqrt on both sides

=> a = 1.2

User Heliton Martins
by
8.3k points

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