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
\( 34.8 + b = 54.6 \)


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