Find the perimeter of the polygon if ZB = ZD.
11.5 cm
B
12.5 cm
D
13.5 cm
С
P = [ ? ] cm

side side side

side angle angle

angle side angle

side angle side

step-by-step explanation:

7

step-by-step explanation:

true

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116