Penjelasan dengan langkah-langkah:
a. 3 x 30° = 90° = siku siku
b. (4 x 30°) - (50 x ½°) = 120 - 25 = 95° = tumpul
c. (1 x 30°) - (5 x ½) = 30 - 2,5 = 27,5° = lancip
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Penjelasan dengan langkah-langkah:
a. 3 x 30° = 90° = siku siku
b. (4 x 30°) - (50 x ½°) = 120 - 25 = 95° = tumpul
c. (1 x 30°) - (5 x ½) = 30 - 2,5 = 27,5° = lancip