Jawabanmu

2014-04-17T13:24:50+07:00
Sin A =depan/miring=2√7/6=√7/3
Di pilihannya: A. 1/2 , B. 1/2V2 , C. 1/2V3 , D. 1/3V2 , E. 1/3V3
Jawaban paling cerdas!
2014-04-17T13:32:44+07:00
A^2=b^2+c^2-2bc cosA......28=16+36-48 cosA......24=48 cosA....cosA=1/2....A=60...sinA=sin 60=1/2 akar3
cara hitung 2V7^2 gimana?
2^2×(akar7)^2=4×7=28