Tolong pake cara pls :3
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C = 4m
D = 5 m.
α = 90+30 = 120°
Maka:
a. C+D = √C²+D²+2.C.D.cos 120
= √4²+5²+2.4.5.-0,5
= √16+25-20 = √21 m
b. C-D = √C²+D²-2.A.B cos 120
= √4²+5²-2.4.5.-0,5
= √16+25+20 = √61 m
c. D-C = √D²+C²-2.D.C.cos 120
= √5²+4²-2.5.4.-0,5
= √25+16+20 = √61 m