Question

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#terima kasih!

Answer 1

Verified answer

4]
a)
∠A : ∠B : ∠ACB = 6 : 7 : 5

misal
∠A = 6x
∠B = 7x
∠ACB = 5x

∠A + ∠B + ∠ACB = 180°
6x + 7x + 5x = 180°
18x = 180°
x = 180° / 18
x = 10°

maka :
∠A = 6x = 6(10°) = 60°
∠B = 7x = 7(10°) = 70°
∠ACB = 5x = 5(10°) = 50°
============================
b)
∠ACD = 180° - ∠ACB
           = 180° - 50°
           = 130°

5]
a)
Luas = 1/2 x a x t
         = 1/2 x AB x AC
         = 1/2 x 60 x 80
         = 2.400 mm²

c)
Luas = 1/2 x BC x AD
2.400 = 1/2 x 100 x AD
2.400 = 50 x AD
AD = 2.400 / 50
AD = 48 mm