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t1 = 60 cm
p2 = 40 - 10 = 30 cm
ditanya : luas bagian bawah foto
jawab
dikali silang
40 × p2 = 60 × 30
40p2 = 1800
p2 = 1800/40
p2 = 45cm
p2 = p1 -5 -x
45= 60 - 5 - x
45 = 55 - x
45 - 55= -x
-10 = -x
10 = x
jadi
10 × 40 = 400cm
semoga bermanfaat