Найдите объем пирамиды, вершинами которой являютсяточки а, в, с, d, с1 правильной четырехугольной призмы авсdа1в1с1d1, площадь основания которой 9, а боковое ребро равно 7.

1 с

2 a

3 a

4 a

5 b

6 a

7 c

8 b

9 c

10 a

11 c

12 a

1. i had to keep my son home from school today because he had a of 38. c) temperature

2. is there anything you'd like me to get you? a) else

3. i like going to england in the summer because it gives me a to speak english. a) chance

4. when we were in spain last year we at a marvellous hotel overlooking the beach. a) stayed

5. my sister lives london. b) near

6. does your husband ever offer to do the a) washing-up

7. the doctor gave her a for some medicine. c) prescription

8. when a fire broke out in the louvre, at least twenty paintings were destroyed. b) priceless

9. there is a lot of talk nowadays about rights. c)human

10. i usually up at 7 o'clock in the morning. a) get

11.the psychiatrist asked his patient to down on the couch. b) sit

12.the new musical was a great success. the loved it. a) audience