Write and simplify an expression for the perimeter of each figure
2 answers:
Answer:
20a - 2b - 1
Step-by-step explanation:
The perimeter is the sum of the 3 sides of the triangle, that is
perimeter = 9a - 4 + 7a + 3 + 4a - 2b ← collect like terms
= (9a + 7a + 4a) - 2b + (- 4 + 3)
= 20a - 2b - 1
The picture is a bit blurry but the perimeter of a shape is the lengths added.
(4a - 2b) + (7a + 3) + (9a - 4) = perimeter, I added the sides together
Combine like terms to get:
4a + 7a + 9a = 20a
-2b is left along becuase there are no other like terms
3 - 4 = -1
The perimeter is 20a - 2b - 1
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