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h = 20 cm
V = ⅓ * Pp * h
Pp = ¼ * a²√3
V = ⅓ * ¼ * a²√3 * h
V = ⅓ * ¼ * 10²√3 * 20
V = ⅓ * ¼ * 100√3 * 20
V = ⅓ * ¼ * 2000√3
V = 16⅔ √3 cm³
Odp. Objętość tego ostrosłupa wynosi V = 16⅔ √3 cm³.
pp=100 pierw z 3/4=25 pierw z 3
v=1/3pp*H
v=1/3 * 25pierw z 3 *20
v=500pierw z 3/3 cm3
V=₃¹Pp*H
V=1/3 * 250√3 *20=⁵⁰⁰√³₃≈167√3