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maka,
∠c +∠ b+∠a=180(jumlah sudut didalam segitiga 180 derajat)
68 +68 + ∠a =180
136 +∠a =180
∠ a= 180 - 136= 44 derajat
jadi besar sudut a adalah 44 derajat
semoga membantu
karena ∠B =∠C =68°
berarti ∠A + 68 + 68 = 180
∠A = 180 - 136
= 44