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P = 80π
r = 4
Wzór na pole stożka:
P = πr(r+l)
Podstawiamy i obliczamy:
80π = π4(4+l) |:π
80 = 4(4+l)
80 = 16 + 4l |-16
64 = 4l | :4
l = 16
Odp. Długość tworząca stożka wynosi 16.
80 = 4(4+l)
80 = 16 + 4l |-16
64 = 4l | :4
l = 16