Diện tích hình vuông là :

    12 x 12 = 144 ( cm vuông )

Vì diện tích hình vuông bằng diện tích hình tam giác nên 144 cũng chính là diện tích hình tam giác đó.

    Cạnh đáy hình tam giác là :

     144 x 2 : 16 = 18 ( cm )

                    Đáp số : 18cm

Độ dài đáy BC là:

    4,75 : 2,5 x 2 = 3,8 (dm)

      Đ/s:..

250+50=300

1. I .... (study) at 8.00 tomorrow.

2. You (wait) for her when her plane arrives tonight?

3. Don’t phone me between 7 and 8. We .....(have) dinner then.

4. What clothes do you think she ... (wear) when she arrives?

5. I .....(send) in my application tomorrow.

6. Linda ....... (arrive) in Ha Noi around March.

7. Next week at this time, you..... (lie) on the beach.

8. My uncle can’t come to your party tomorrow night because he ... (work) at night.

9. You .... (meet) your former teachers at 9 a.m. tomorrow morning, won’t you?

10. At this time tomorrow evening, I ....(play) computer games in my bedroom.

1. We should use them and try to find out ... ECONOMY

alternative sources of power.

2. Solar energy is ... , plentiful and clean. RENEW

3. I think that solar energy can be an ... source of ALTER

energy in the near future.

4. We should reduce the use of ... at home. ELECTRICAL

5. It’s a clean source of energy. Sailboats couldn’t move without POWERFUL

this .

6. Waves will be used as an ... friendly source of energy. ENVIRONMENT

7. Limit car trips by relying on biking, walking, public ... TRANSPORT

.

8. Solar power can be used to ... or cool our houses. HOT

9. Energy is used to ... a lot of electrical things. PRODUCT

10. There will be a ... of energy in the near future. SHORT

1. Students will use public transport to go to school.

→ ................................................................................................................................

2. Solar power will generate a great deal of electricity this summer.

→ ................................................................................................................................

3. Will they install the solar panels on the roof of the house tomorrow?

→ ................................................................................................................................

4. Local people won’t burn plants to heat this winter.

→ ................................................................................................................................

5. The smoke from factories will pollute the air.

→ ................................................................................................................................

6. They will build a hydro power station in this area.

→ ................................................................................................................................

1. Many countries/ already using/ solar energy.

....................................................................................................................................

2. save/ energy/ one/ best/ way/ conserve/ natural/ resources.

....................................................................................................................................

3. At present/ most/ our electricity/ come/ use/ coal, gas, oil or nuclear power.

....................................................................................................................................

4. plant/ tree/ create/ shade/ around/ house/ help/ keep/ cool.

....................................................................................................................................

5. This power/ could/ provide/ sun.

....................................................................................................................................

6. not leave/ fridge/ open/ cold air/ escape/ use/ lot/ electricity.

....................................................................................................................................

7. One percent/ solar energy/ reach/ earth/ enough/ provide power/ the total population.

....................................................................................................................................

8. Turn/all/light/every/time/leave/room.

....................................................................................................................................

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