1) V = Sh, S=a^2, h =a*tgA, V=a^3 * tgA
2) S(диагональна...) = √(15^2+20^2)*h; h =1/60 cm; V = 5cm^3
3)a = H tgB√3, V = 3H^3 tg^2B/4√3
4)cosA = 21/42=1/2. a = 42√3sinA. P = 189. S = 1/2*189*42=3969(cm^2)
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Answers & Comments
1) V = Sh, S=a^2, h =a*tgA, V=a^3 * tgA
2) S(диагональна...) = √(15^2+20^2)*h; h =1/60 cm; V = 5cm^3
3)a = H tgB√3, V = 3H^3 tg^2B/4√3
4)cosA = 21/42=1/2. a = 42√3sinA. P = 189. S = 1/2*189*42=3969(cm^2)