April 2019 0 16 Report
Zad 1
Oblicz promień r okręgu wpisanego w trójkąt i promień R okręgu opisanego na trójkącie, wiedząc, ze boki tego trójkąta mają długości :7cm , 8cm,9cm.
Zad 2
Pole trapezu jest równe 20, wysokość trapezu i krótsza podstawa mają taka samą długość , równa 4. Oblicz dłuższą podstawę trapezu.
Zad 3
Uzasadnij, że czworokąt o wierzchołkach A,B,C,D, gdzie A=(-3;2), B=(3;-4), C=(5;1), D=(2;4) jest trapezem. Oblicz obwód tego trapezu.
Zad 4
Długość jednej z przekątnych rombu jest równa długości jego boku. Oblicz pole tego rombu, wiedząc, że jego bok ma długość 4 cm.
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Przeczytaj tekst z którego usunięto pięć zdań.Uzupełnij luki w tekście (1-5) odpowiednimi zdaniami (A-F).Jedno zdanie zostało podane dodatkowo i nie pasuje do żadnej luki. A few years ago,everyone was talking about the new electric cars. They were going to be the answer to our pollution problems.(1)___ Why aren't our roads full of electric cars? Why are we still sending out huge amounts of pollution into the atmosphere and using oil faster than the oil companies can produce it? There are several reasons.It's not because the cars aren't for sale .They are. There are many different models and every year another ,newer type of electric car is designed.(2)__Many of the faster ,sporty-looking models are expensive,but there are also plenty of cheaper types for sale. So what is the reason? Experts say that it's mainly because electric cars can't travel very far before their batteries need to be charged and there simply aren't enough charging points at the moment.(3)_____ It seems that the people who have bought electric cars use theam as a second car,not their main one.(4)____ The aren't going to buy an electric car for regular use until they can be sure that they are not going to stop on their way to work or somewhre important. The hybrid car -a car that can switch from petrol to electricy -is more popular and more and more people are buying it.(5)_____It's obviously not quite as good for the environment as the electric car,but it shows that people are concarned and are trying to do something about their carbon footprints. A. It isn't because of the price. B.The only problem here is the cost ,but in the future this will probably get much cheaper. C.So,where are they? D.People worry about not having enough electricity. E.Many people don't buy them because the look small and ugly. F. People need a car that is reliable. Proszę na dziś dam naj !!! "D
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