Write an expression for the length of the polyline ABCD? if AB = a, BC is 8.45 cm less than AB, and CD is 1.27 in. more than AB and simplify it.
AB = a, if BC is 8.45 cm less than AB, then BC = (a – 8.45) cm.If CD is 1.27 dm = 12.7 cm more than AB, then CD = (a + 12.7 ) cm.
The length of the broken line ABCD is equal to AB + BC + CD = a + (a – 8.45) + (a + 12.7) = a + a – 8.45 + a + 12.7 = 3a + 4.25 (cm) …
Answer. (3a + 4.25) cm.
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