Penjelasan dengan langkah-langkah:
bc = 18 cm
a. panjang ac
sin 60° = ac/bc
√3/2 = ac/18
18√3 = 2ac
ac = 9√3 cm
b. panjang ab
sin 30° = ab/bc
1/2 = ab/18
18 = 2ab
ab = 9 cm
c. Luas
= a x t : 2
= 9√3 x 9 : 2
[tex] = \frac{81}{2} \sqrt{3} \: \: {cm}^{2} [/tex]
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Verified answer
Penjelasan dengan langkah-langkah:
bc = 18 cm
a. panjang ac
sin 60° = ac/bc
√3/2 = ac/18
18√3 = 2ac
ac = 9√3 cm
b. panjang ab
sin 30° = ab/bc
1/2 = ab/18
18 = 2ab
ab = 9 cm
c. Luas
= a x t : 2
= 9√3 x 9 : 2
[tex] = \frac{81}{2} \sqrt{3} \: \: {cm}^{2} [/tex]