Oblicz pole powierzchni i objetość kuli o promieniu: a)4cm b)2,5cm c)3/7cm d)pierwiastek z 5 cm

[latex]a)\P=4 pi R^{2}\P=4 pi (4cm)^{2}\P=4 pi *16cm^{2}\P=64 pi cm^{2}\\V=frac{4}{3} pi R^{3}\\V=frac{4}{3} pi (4cm)^{3}\\V=frac{4}{3} pi *64cm^{3}\\V=frac{256}{3} pi cm^{3}[/latex] [latex]b)\P=4 pi R^{2}\P=4 pi (2,5cm)^{2}\P=4 pi *6,25cm^{2}\P=25 pi cm^{2}\\V=frac{4}{3} pi R^{3}\\V=frac{4}{3} pi (2,5cm)^{3}\\V=frac{4}{3} pi *15,625cm^{3}\\V=frac{4}{3} pi *15frac{5}{8}cm^{3}\\V=frac{4}{3} pi *frac{125}{8}cm^{3}\\V=frac{125}{6} pi cm^{3}[/latex] [latex]c)\P=4 pi R^{2}\P=4 pi (frac{3}{7}cm)^{2}\P=4 pi *frac{9}{49}cm^{2}\P=frac{36}{49} pi cm^{2}\\V=frac{4}{3} pi R^{3}\\V=frac{4}{3} pi (frac{3}{7}cm)^{3}\\V=frac{4}{3} pi *frac{27}{343}cm^{3}\\V=frac{36}{343} pi cm^{3}[/latex] [latex] b)\P=4 pi R^{2}\P=4 pi ( sqrt{5} cm)^{2}\P=4 pi * sqrt{25} cm^{2}\P=4 pi *5cm\P=20 pi cm^{2}\\V=frac{4}{3} pi R^{3}\V=frac{4}{3} pi ( sqrt{5} cm)^{3}\V=frac{4}{3} pi * sqrt{125} cm^{3}\V=frac{4}{3} pi * sqrt{25*5} cm^{3}\V=frac{4}{3} pi *5 sqrt{5} cm^{3}\V=frac{20}{3} sqrt{5} cm^{3}[/latex]