Question

1 . the side of a square is (5a - 9b) metres, find its perimeter .

2 . find the perimeter of an equilateral triangle having one of its sides as ( 3x + 4y) metres .
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Answer 1

Answer:

20a-36b

9x+12y

this is the answer direct

Answer 2

1.....p= 4×s

s=5a-9b

p=4(5a-9b)= 20a-36b

2.....perimeter =sum of all the sides

one side = 3x+4y

p= 3x+4y +3x+4y+3x+4y = 9x +12y