Minta tolong ya.. No. 34 sama 35 (beserta caranya)
DB45
34. ΔABC , Luas = 48 , AC = 16, dan AB = 12 L = 1/2 (AC)(AB) sin A 48 = 1/2 (16)(12) sin A sin A = 48/96 = 1/2 cos A = √(1 - sin² A)= √(1 - (1/2)²= √(1 - 1/4)= √(3/4) cos A = 1/2 √3
35. K = d+e+f = 1,5 + 2 + 2,5 = 6 S = 1/2 K = 1/2(6) = 3
Luas = √{s (s-d)(s-e)(s-f) L = √{3(1,5)(1)(0,5) L = √(2,25) L = 1,5 cm²
L = 1/2 (AC)(AB) sin A
48 = 1/2 (16)(12) sin A
sin A = 48/96 = 1/2
cos A = √(1 - sin² A)= √(1 - (1/2)²= √(1 - 1/4)= √(3/4)
cos A = 1/2 √3
35. K = d+e+f = 1,5 + 2 + 2,5 = 6
S = 1/2 K = 1/2(6) = 3
Luas = √{s (s-d)(s-e)(s-f)
L = √{3(1,5)(1)(0,5)
L = √(2,25)
L = 1,5 cm²