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208 = 2{p.(p-2) + (p.p) + ((p-2) . p)}
208 = 2{p²- 2p + 1/2p² + 1/2p² - p}
208 = 2{ 2p² - 3p}
208 = 4p² - 6p
4p² - 6p - 208 = 0
(4p²-32p)+(26p-208)
4p(p-8) +26(p-8)
(4p+26)(p-8)
(p-8) = 0
p = 8 cm
V = p × (p-2) × 1/2p cm³
= 8 × (8-2) × 1/2.8 cm³
= 8 × 6 × 4 cm³ = 192 cm³