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a=7cm
H = 20 cm
V = Pp *H = a²H = 49*20 = 980cm³
2
a = 10dm
H = 15dm
V = Pp *H = (a²√3)/4 * 15 = 25√3 *15 = 375√3 dm³
3
a = 8cm
H =10cm
V = Pp *H = (3a²√3)/2 * 10 = 96√3 *10 = 960√3 cm³