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1) 1.380 = La. 23
La = 1.380 / 23
= 60
La = 1/2. a. t
60 = 1/2. 8. t
= 4. t
t = 60/4
= 15 cm
2) 320 = La. 8
La = 320/8
= 40 cm²
3) V = πr². t
= 3,14. 5². 10
= 3,14. 25. 10
= 785 cm³
4) V = πr². t
= 3,14. 18². 34
= 34590,24 dm³
5) 1.848 = 22/7. r². 12
r² = 1848 . 7 / (22. 12)
= 49
r = √49
= 7 dm