Question is unclear to me ,, can you rewrite it in a nicer way so i can answer?
-6.86666666667 this is the answer for your question
The length of each side is 28 cm.
the perimeter of the equilateral triangle is 48 cm. To find each side of the original triangle, you do 48/3=16cm. since the triangle dilate by 0.75, then you can just do 0.75*16=12cm. then you have to add 12 to 16 because the triangle gets bigger by 12 cm. so 16+12=28 cm.
Try 116, you add up all the numbers and subtract by 180.
