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Verified answer
A = 6cmu8 = a + 7b = 34
6 + 7b = 34
7b = 28
b = 28/7 = 4
S8 = 1/2n (a + u8)
= 1/2*8 (4 + 34)
= 4 (38)
= 152 cm
semoga bermanfaat :)