Площадь прямоугольника 42 см в квадрате, его ширина равна 6см.найди периметр прямоугольника

42: 6=7см длина прямоугольника р= (а+в)*2 р=(6+7)*2=26см периметр прямоугольника

Hello, my dear pen pal! i want to tell you about how i spent my winter vacation.they were so full of fun and pleasant surprises that i think i will remember them all my life.on the very first day of the holidays, soft and fluffy snow fell out. the next day my friend and i ran to ride a sled and sculpt snowmen.for a whole week i was in the city and had fun with a friend. in the evenings, my parents and i were slowly preparing for the new year and for christmas.on holidays we came to our grandmother and grandfather, they had a gift for me - a real snowboard! my joy was boundless! the same evening my parents said that we all go to the mountains to a winter resort.there i rolled my snowboard. at first i did not get very well, but eventually i was confidently standing on my feet. to be honest, my dad is a professional snowboarder, so he became my personal trainer.after returning from the resort, i managed to have a good rest and prepare for school.by the way, i am seriously thinking about becoming a professional snowboarder - just like my beloved daddy. tell me about how you spent your winter vacation, i will be very interested.i wish you all the best! i'm waiting for an answer, my dear friend!

i способ:

 

s₁ - площадь прямоугольника

s₂ - площадь квадрата

а₁ - длина прямоугольника

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s₁=640 м²

а₁=40 м

р₁=р₂

b₁ - ? м

s₂ - ? м²

решение:

s₁=a₁·b₁  ⇒ b₁=s₁: а₁=640: 40=16 (м) -  ширина прямоугольника.

р₁=2(а₁+b₁)=2(40+16)=2·56=112 (м) - периметр прямоугольника.

 

р₁=р₂ 

р=4а - формула периметра для квадрата.

 

р₂=4а₂  ⇒ а₂=р₂: 4=112: 4=28 (м) - сторона квадрата.

 

s=a² - формула площади для квадрата.

 

s₂=a₂²=28²=28·28=784 (м²) - площадь квадрата.

ответ: 784 м² площадь квадрата.

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ii способ:

 

- длина

 

  - ширина

 

- площадь прямоугольника

 

- площадь квадрата

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м²

 

м

 

м

 

  м²

 

решение:

 

  ⇒  (м) - ширина прямоугольника.

 

- периметр прямоугольника.

 

 

- формула периметра для квадрата.

 

  ⇒  (м) - сторона квадрата.

 

- формула площади для квадрата.

 

(м²)  - площадь квадрата.

 

ответ:   площадь квадрата  784 м².