tolong di bantu mau dikumpul

AB^2 = AC^2 + BC^2 -2AB.AC.cos60
= 36 + 16 - 2 x 6 x 4 x 1/2
= 52 - 24
= 28

AB^2 = 28
Maka AB = √28 = 4√7 cm

Note: ^2 =pangkat 2

Semoga membantuu :)