cạnh hình vuông là:

60 : 4 = 15cm

diện tích hình vuông là:

15 x 15 = 225cm2

bị thiếu đề

http://olm.vn/hoi-dap/question/74273.html

Diện tích tất cả các tam giác gấp 5 lần diện tích hình vuông là :

156,25 x 5 = 781,25

Đáp số : 781,25

1. She____________ thirteen on her next birthday. (will be/is/was/has been)

2. MY brother eats a lot of junk food, _____________ he puts on a lot of weight. (but/and/so/or)

3. We shouldn't spend much time ____________ TV. (watching/watches/to watch/watched)

4. The doctor advised him to play ______________ sports to have good health. (less/more/little/many)

5. If you drink too much iced - water, you will have a _______________. (headache/toothache/sore throat/temperature)

6. We find _______________ flowers interesting because it help us relax. (arranging/arranged/ to arrange/ arranges)