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Sudut E + sudut F = 180 derajat
(2y+13) + (3y+2) = 180 derajat
5y + 15 = 180 derajat
5y = 180 - 15 derajat
5y = 165 derajat
y = 165/5 derajat
y = 33 derajat
sudut E = 2y + 13
= 2.(33) + 13 derajat
= 66 + 13 derajat
= 79 derajat ....jawaban A
2y + 13 + 3y +2 = 180
5y + 15 = 180
5y = 165
y = 165/5
y = 33
sudut E = 2y + 13 = 2 (33) + 13 = 66 + 13 = 79 (A)