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Chiều cao của hình thang là
\(\dfrac{30,15\times2}{7,8+5,6}=4,5\left(cm\right)\)
67 dam2 51m2 = 67 dam2 + 
m2 = 
dam2
82 dam2 7m2 = 82dam2 + 
m2 = 
dam2
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U
Chu vi hình tròn là: 19 x 3,14 = 59,66 (cm)
Diện tích hình tròn là: 7,8 x 7,8 x 3,14 = 191,0376 (cm2)
chu vi 1 hình thoi là
2,6.4=10,4(cm)
chu vi 3 hình thoi là
10,4.3=31,2(cm)
Vì tam giác ABC đc tạo nên từ 3 hình thoi => chu vi tam giác ABC = 31,2 cm
3 d a m 2 = 300 m 2 2 d a m 2 90 m 2 = 290 m 2
15 h m 2 = 1500 d a m 2 17 d a m 2 25 m 2 = 1705 m 2
500 m 2 = 5 d a m 2 20 h m 2 34 d a m 2 = 2034 d a m 2
7000 d a m 2 = 700 000 m 2 892 m 2 = 8 d a m 2 92 m 2
7,8cm=0,78 dm
97,2m=9720cm
7,8mm=0,0078
2dam=0,2 hm
2,7m2=270dm2
9,78km2=97800dam2