The perimeter of the scalene triangle is 54.6 cm.

Which equation can be used to find the value of b if side a measures 8.7 cm?
8.7 + b = 54.6
17.4 + b = 54.6
26.1 + b = 54.6
34.8 + b = 54.6

the correct question is
The perimeter of the scalene triangle is $$54.6$$ cm.
Which equation can be used to find the value of b if side a measure $$8.7$$ cm and side c measure $$26.1$$ cm?

we know that
the perimeter of a triangle is equal to

$$P=a+b+c \\ P=54.6 cm$$ equation 1

$$P=a+b+c \\ P=8.7+26.1+b$$ equation 2

equate equation 1 and equation 2
$$54.6=(8.7+26.1)+b \\ 54.6=34.8+b$$

therefore

the answer is the option D
$$34.8 + b = 54.6$$

RELATED: