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sudut A +sudut B +sudut C = 180
x + 70 + 20 =180
x + 90 = 180
x = 180-90
x = 90
semoga bermanfaat :)
berarti sudut C = 20
sudut B = 70
segitiga sudutnya kalo di jumlah 180
sudut A = 180 - sudut B + sudut C
= 180 - 70 + 20
= 180 - 90
= 90
Jadi sudut A besarnya 90