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National and Regional Contests
Spain Contests
Spain Mathematical Olympiad
1968 Spain Mathematical Olympiad
4
4
Part of
1968 Spain Mathematical Olympiad
Problems
(1)
volume enclosed between roof and pavement
Source: Spanish Mathematical Olympiad 1968 P4
12/4/2022
At the two ends
A
,
B
A, B
A
,
B
of a diameter (of length
2
r
2r
2
r
) of a pavement horizontal circular rise two vertical columns, of equal height h, whose ends support a beam
A
′
B
′
A' B'
A
′
B
′
of length equal to the before mentioned diameter. It forms a covered by placing numerous taut cables (which are admitted to be rectilinear), joining points of the beam
A
′
B
′
A'B'
A
′
B
′
with points of the circumference edge of the pavement, so that the cables are perpendicular to the beam
A
′
B
′
A'B'
A
′
B
′
. You want to find out the volume enclosed between the roof and the pavement.[hide=original wording]En los dos extremos A, B de un di´ametro (de longitud 2r) de un pavimento circular horizontal se levantan sendas columnas verticales, de igual altura h, cuyos extremos soportan una viga A' B' de longitud igual al diametro citado. Se forma una cubierta colocando numerosos cables tensos (que se admite que quedan rectilıneos), uniendo puntos de la viga A'B' con puntos de la circunferencia borde del pavimento, de manera que los cables queden perpendiculares a la viga A'B' . Se desea averiguar el volumen encerrado entre la cubierta y el pavimento.
geometry
3D geometry