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ill get help @Keigh2015 @Mehek14

This is a classic example of the cosine rule
Do you know the cosine rule?

a^2+b^2=c^2 ?

no - htat is the Pythagoras rule
cosine rule is
a^2 = b^2 + c^2 - 2bc cos(A)
do oyu recognise that?

yes i do

so 1.3^2 is equal to x^2 + 1.1^2

hte formula you gave me makes no sense with te triangle

the**

x^2= 2.9

is as far as i got... - 2bc doesnt make any sense

will you attempt to explain?