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= 8√2
diagonal ruang = s√3
= 8√3
a. <PRT = arc tg (pt / pr)
= arc tg (8 / 8√2)
= arc tg (1/2 √2)
= 35,3
b. <UVT = arc tg (ut/uv)
= arc tg (8/8)
= 45°
c. <WPS = arc tg (ws/ps)
= arc tg (8/8)
= 45°
d. < SRT = arc tg (st/sr)
= arc tg (8√2 / 8)
= arc tg √2
= 54,7°