Cho hình thang ABCD (AB song song CD; AB>CD) các tia phân giác A và D cắt nhau tại I các tia phân giác B, C cắt nhau tại J
a) chứng minh AI vuông góc với DI và BJ vuông góc CJ
b gọi E giao điểm AI và BJ giả sử Ethuộc cạnh CD, chứng minhCD=AD+BC

the solution is 12x-6y

the smallest possible measurement of the width is 14 feet

step-by-step explanation:

let's assume length of parallelogram is 'l'

width of parallelogram is 'w'

the perimeter of a parallelogram must be no less than 40 feet

so, we get

we are given

length of parallelogram is 6 feet

so,

l=6

we can plug it

now, we can solve for w

subtract both sides by 12

divide both sides by 2

and we get

so,

the smallest possible measurement of the width is 14 feet

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step-by-step explanation: