Hello student. In this class I will solve with you questions of plane geometry already charged in ENEM. I hope you like it ???? WATCH THE OTHER REVIEWS: https://bit.ly/35z532d ????+ CLASSES FOR VESTIBULAR EXAMS: encurtador.com.br/flLZ7 ???? GROUP ON TELEGRAM TO DOWNLOAD THE MATERIALS: https://t.me/joinchat/AAAAAFU4kZtIQ-x... ???? FOLLOW ON INSTAGRAM: https://goo.gl/bMPqqu 1. (Enem 2019) Constructing figures of different types, just by folding and cutting paper, without glue and without scissors, is the art of origami (ori = to fold; kami = paper), which has a highly symbolic meaning in Japan. The basis of origami is the knowledge of the world through touch. A young girl decided to build a swan using the origami technique, using a sheet of paper measuring 18 thicksp cm by 12 thicksp cm. So, she started by folding the sheet as shown in the figure. After this first fold, the measurement of segment AE is a) 2sqrt{22} thicksp cm. b) 6sqrt3 thicksp cm. c) 12 thicksp cm. d) 6sqrt5 thicksp cm. e) 12sqrt2 thicksp cm. 2. (Enem PPL 2019) The unit of measurement used to announce the size of television screens in Brazil is the inch, which corresponds to 2.54 thicksp cm. Contrary to what many people imagine, saying that a TV screen is X inches means that the diagonal of the rectangle that represents its screen measures X inches, as shown in the illustration. A museum administrator received a conventional 20-inch TV, whose length (C) to height (A) ratio is 4:3, and needs to calculate the length (C) of this TV in order to place it on a shelf for display. The screen of this TV has a length of C, in centimeters, equal to a) 12.00. b) 16.00. c) 30.48. d) 40.64. e) 50.80. 3. (Enem 2018) Sliding seat rowing is a sport that uses a boat and two oars of the same size. The figure shows one of the positions of a technique called spreading. In this position, the two oars meet at point A and their other ends are indicated by points B and C. These three points form a triangle ABC whose angle Bhat{A}C measures 170°. The type of triangle with vertices at points A, thicksp B and C, at the moment the rower is in this position, is a) scalene rectangle. b) scalene acute-angled. c) isosceles acute-angled. d) scalene obtuse-angled. e) isosceles obtuse-angled. 4. (Enem PPL 2018) The slope of a roof depends on the type and brand of tiles chosen. The figure is the sketch of the roof of a specific owner's house. The tiles will be supported on the flat square surface ABCD, with BOC being a right-angled triangle at O. It is known that h is the height of the roof in relation to the lining of the house (the flat figure ABOE), b = 10 is the length of the segment OB, and d is the width of the roof (segment AB), all measurements given in meters. It is known that, depending on the type of tile chosen by the owner, the percentage i of ideal roof slope, described by the relation i = rac{h imes100}{b}, is 40%, and that the expression that determines the number N of tiles needed for the roof is given by N = d ^ 2 imes 10.5. Furthermore, these tiles are only sold in thousands. The owner believes that it is essential to respect the ideal slope informed by the manufacturer, so he argues that it is necessary to purchase the minimum quantity of tiles corresponding to a) one thousand. b) two thousand. c) three thousand. d) six thousand. e) eight thousand. 5. (Enem PPL 2018) A toy called a bouncy castle, when seen from above, consists of a trampoline with an outline in the shape of a regular hexagon. If the area of ​​the circle inscribed in the hexagon is 3pi square meters, then the area of ​​the hexagon, in square meters, is a) 9 b) 6sqrt3 c) 9sqrt2 d) 12 e) 12sqrt3 6. (Enem 2018) The figure shows a circular square that contains a fountain in its center and, in its surroundings, a sidewalk. The circles that define the square and the fountain are concentric. The sidewalk will have its floor covered with tiles. Unable to calculate the radii, since the fountain is full, an engineer made the following measurement: he stretched a tape measure tangent to the fountain, measuring the distance between two points A and B, as shown in the figure. With this, he obtained the measurement of the line segment AB: 16 thicksp m. With only this measurement, the engineer correctly calculated the measurement of the area of ​​the sidewalk, in square meters. The measurement found by the engineer was a) 4pi b) 8pi c) 48pi d) 64pi e) 192pi #ENEM #MATHEMATICS