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Fill in the correct word. -stay- -hire- -spend- -post- - have- -travel- - attend- -taste- -take- -go- 9) On our holiday in Spain we are going to the local food. 10) We can a car in Barcelona. It's not very expensive. 11) Do you know where I can these letters? 12) She wants to … in a hotel. 13) Don't forget to … pictures at the wedding. 14) Ann decided to … around the world. 15) Why don't we … a picnic on Sunday? 16) She wants to … a performance at the theatre. 17) They are going to … sightseeing in the afternoon. 18) How are you going to ………your weekend? Underling the correct item. 19) Mike is flying / will fly to Paris on Monday. 20) The doorbell is ringing. I will / am going to answer. 21) We haven't got any oranges. Will you buy / Are you buying some? 22) She is tired. She will / is going to sleep early tonight. 23) It' s too cold. I will / am going to close the window. 24) Ann is visiting Paris. She will / is going to see the Eiffel Tower. 25) My mother is going to / will buy a new car next week. Fill in the gaps with will or be going to and the verbs in brackets. 26) The children … (meet) their new teacher on Tuesday afternoon 27) It's too hot in here. I … (open) the window. 28) I forgot to post that letters. I … (do) it now. 29) It's sunny outside. I … (wear) my sunglasses. 30) He ………… (learn) English next year. 5. Put the words in the correct order to make sentences. 31) dishes/to/you/going/the/are/wash? 32) museum/visiting/is/John/the/tomorrow. 33) soon /to/ going/ are/ they/move/home 34) week/dictionary/ a/ I/ buy/ going/ am /to/ new/ next. 35) tomorrow/to/flying/Russia/is/she
Высота трапеции = 24.
Пошаговое объяснение:
Дано: ABCD - прямоугольная трапеция, r = 12 (радиус вписанной окружности).
Найти высоту трапеции h.
Решение.
т.E - центр вписанной окружности.
Четырехугольник HBGE является квадратом, так как:
∠H = 90°; ∠ G =90° , угол между касательной и радиусом, проведенным в точку касания = 90°,
∠B = 90° по условию трапеция прямоугольная.
Значит ∠E = 90°, сумма углов в четырехугольнике = 360°.
⇒ HBGE прямоугольник.
В прямоугольнике противолежащие стороны равны.
GE = EH, радиусы вписанной окружности.
HB = BG, отрезки касательных проведенных из одной точки до точек касания равны.
⇒ все стороны HBGE равны между собой и равны радиусу вписанной окружности r.
Аналогично, AHEF также является квадратом, со стороной = r.
Тогда высота трапеции h = 2r = 2 * 12 = 24.