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U5 = 23 cm
4b = 23-15 = 8cm
b = 8 / 4 = 2cm
U1 = 15 cm
U2 = 17 cm
U3 = 19 cm
U4 = 21 cm
U5 = 23 cm
total keseluruhan
= U1 + U2 + U3 + U4 + U5
= 95 CM
U5 = 23
23 = a + 4b
23 = 15 + 4b
8 = 4b
2 = b
S5 = 5/2 (2.15 + 2(5 -1))
S5 = 5/2 (30 + 8)
S5 = 5/2 x 38
S5 = 95