HHHELP PLEASE

its 31.5

Step-by-step explanation:

first use the law of cosines to find the largest angle

since 13 is the longest side then angle C is the largest angle

so

so its

then ÷ the equation by -131.6 and find the cos inverse of the angle to get C=76

after that use the law of sines

then u get sinA =0.52

and again use sin inverse

so A= 31.5