Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Q: Paragraph- Sent 1: Paul put the despised watch away And laid out before him his array Of stones and metals, and when the morning Struck the stones to their best adorning, He chose the brightest, and this new watch Was so light and thin it seemed to catch The sunlight's nothingness, and its gleam.
Sent 2: Topazes ran in a foamy stream Over the cover, the hands were studded With garnets, and seemed red roses, budded.
Sent 3: The face was of crystal, and engraved Upon it the figures flashed and waved With zircons, and beryls, and amethysts.
Sent 4: It took a week to make, and his trysts At night with the Shadow were his alone.
Sent 5: Paul swore not to speak till his task was done.
Sent 6: The night that the jewel was worthy to give.
Sent 7: Paul watched the long hours of daylight live To the faintest streak; then lit his light, And sharp against the wall's pure white The outline of the Shadow started Into form.
Sent 8: His burning-hearted Words so long imprisoned swelled To tumbling speech.
Sent 9: Like one compelled, He told the lady all his love, And holding out the watch above His head, he knelt, imploring some Littlest sign.
Sent 10: The Shadow was dumb.
Question: Did Paul follow through on his swear not to speak until he was done making his watch?.

A: Yes.
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Q: Paragraph- Sent 1: Sam Farragut is a sociopathic business executive in Southern California who forces a team of advertising agency employees to embark on a dangerous dirtbike trip to the Baja California desert in order to compete for his business .
Sent 2: The men are Warren Summerfield , a suicidal middle-aged ad executive who has been fired from the agency ; the straightlaced Paul McIlvain who is inattentive to his wife , and brash art designer Maxon who feels suddenly trapped after his girlfriend announces she is pregnant .
Sent 3: There are numerous long sequences of motorcycle riding on desert backroads .
Sent 4: Summerfield has been having an affair with McIlvian's wife .
Sent 5: He has not told his wife that he was fired and is simply serving out his tenure at the agency while looking for a new position .
Sent 6: His wife is actually aware of the affair .
Sent 7: Farragut convinces the ad men to make the motorcycle journey on the pretext of looking for a location to shoot a commercial .
Sent 8: In reality , Farragut is reckless and looking to involve the men in spontaneous edgy adventure of his own manipulation .
Sent 9: After they leave , McIlvain's wife suspects that Summerfield is planning to kill himself for the insurance money , but she can not convince Summerfield's wife to instigate a search .
Sent 10: The four men travel deeper into Mexico on isolated dirt roads .
Sent 11: At one point Summerfield contemplates plunging off a cliff .
Sent 12: After being humiliated by a young American couple in a Baja bar , Farragut tracks them down on the beach while accompanied by Maxon .
Question: Whose wife is having an affair with a suicidal man?.

A: McIlvian's wife.
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Q: Paragraph- Sent 1: In architecture Durer cites Vitruvius but elaborates his own classical designs and columns.
Sent 2: In typography, Durer depicts the geometric construction of the Latin alphabet, relying on Italian precedent.
Sent 3: However, his construction of the Gothic alphabet is based upon an entirely different modular system.
Sent 4: The fourth book completes the progression of the first and second by moving to three-dimensional forms and the construction of polyhedra.
Sent 5: Here Durer discusses the five Platonic solids, as well as seven Archimedean semi-regular solids, as well as several of his own invention.
Sent 6: In all these, Durer shows the objects as nets.
Sent 7: Finally, Durer discusses the Delian Problem and moves on to the 'construzione legittima', a method of depicting a cube in two dimensions through linear perspective.
Sent 8: It was in Bologna that Durer was taught (possibly by Luca Pacioli or Bramante) the principles of linear perspective, and evidently became familiar with the 'costruzione legittima' in a written description of these principles found only, at this time, in the unpublished treatise of Piero della Francesca.
Sent 9: He was also familiar with the 'abbreviated construction' as described by Alberti and the geometrical construction of shadows, a technique of Leonardo da Vinci.
Sent 10: Although Durer made no innovations in these areas, he is notable as the first Northern European to treat matters of visual representation in a scientific way, and with understanding of Euclidean principles.
Sent 11: In addition to these geometrical constructions, Durer discusses in this last book of Underweysung der Messung an assortment of mechanisms for drawing in perspective from models and provides woodcut illustrations of these methods that are often reproduced in discussions of perspective.
Question: In which book does Durer show the understanding of Euclidean principles?.

A:
His last book.
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