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Na figura, os arcos que limitam a região sombreada são arcos de circunferências de raio R e centrados nos vértices do quadrado ABCD. Se o lado do quadrado mede 2R e considerando !$ \pi=3 !$, então a razão entre a área sombreada e a área branca é
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O gráfico abaixo refere-se aos índices de desistência em um curso de Informática, verificados nos anos de 2010 a 2014. Com base no gráfico, pode-se afirmar que os índices mediano e= médio (aproximado) de desistência do curso nesses anos são, respectivamente
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Human's Best Friend
We know that dogs are human's best friends. They love us and we love them. However, we're not so sure where they came from. Many scientists think they came from wolves 15,000 years ago. Although wolves are wild and dogs are tame, they're still a lot alike. Both wag their tails when happy and put their tails between their legs when scared.
Dogs are easy to educate. Well-educated dogs are sometimes used as watchdogs. A watchdog can stop a creature that is five to six times bigger. It is interesting, though, that these dogs, which can become terrifyingly wild in times of danger, pose no harm to their owners. In the face of a threat, they put their lives in danger to save their owners.
(Adapted from http://www.grammarbank.com)
Choose the correct alternative to have the passive voice from the sentence, in bold type, in the text.
Their lives in danger to save their owners.
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Seja a equação geral da reta !$ ax + by + c = 0 !$.
Quando !$ a=0, b ≠ 0 !$ e !$ c ≠ 0 !$, a reta
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Twenty-First Century Birdwatching
Our ancestors!$ ^{(B)} !$ could spot natural predators from far by their silhouettes. Are we equally aware of the predators!$ ^{(A)} !$ in the present-day? Drones are remote-controlled planes!$ ^{(D)} !$ that can be used for anything from surveillance, to rescue operations and scientific research. Most drones are used today by military powers for remote-controlled surveillance and attack, and their numbers are growing. The Federal Aviation Administration (FAA) predicted in 2012 that within 20 years there could be as many as 30.000 drones flying over U.S. Soil alone. As robotic birds!$ ^{(C)} !$ will become commonplace in the near future, we should be prepared to identify them.
(Adapted from https://medium.com/looking-up/21st-century-birdwatching)
In the text, all the nouns bellow refer to drones, except:
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Read the text to answer question.
The Pilot Fatigue Problem
For years, pilot fatigue has been a real issue. Airline pilots, as well as cargo, corporate and charter pilots can all face fatigue while on the job. While pilot fatigue can be common and overlooked, it poses a very troubling threat to aviation safety and should be taken seriously.
Pilot fatigue has been a real problem since the beginning of air travel. Charles Lindbergh fought to stay awake on his record-breaking 33.5-hour transatlantic flight from New York to Paris on the Spirit of St. Louis. Long-haul pilots have reported falling asleep at the controls. Cargo pilots that fly at night face fatigue from challenging the body's natural internal clock.
The Lindbergh flight provides a great example for the real issue today that fatigue is an acceptable risk and one that isn't given enough credit. Lindbergh flew from New York to Paris without falling asleep. Similarly, pilots today get away with flying tired all the time. If you ask an
average pilot how much sleep he got the night before a flight, it's probably on a par with the average American, which is about six and a half hours.
This might be an acceptable amount of sleep if you have a desk job.
(Source: www.thebalance.com/the-pilot-fatigue-problem)
“on a par with”, in bold type, means
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Sejam os números complexos !$ z_1 = 1 – i !$, !$ z_2 = 3 + 5i !$ e !$ z_3 = z_1 + z_2 !$. O módulo de !$ z_3 !$ é igual a
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As medidas, em cm, dos lados de um pentágono estão em Progressão Aritmética (PA). Se o perímetro desse polígono é 125 cm, o terceiro elemento da PA é
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O universo é um grande laboratório onde transformações estão ocorrendo a todo instante, como as explosões que permitem o surgimento (nascimento) e/ou a morte de estrelas e outros corpos celestes. Em uma noite de céu límpido, é possível observar a luz, proveniente de diferentes estrelas, muitas das quais possivelmente já não mais existem. Sabendo que as ondas eletromagnéticas correspondentes ao brilho destas estrelas percorrem o espaço interestelar com a velocidade máxima de 300.000 km/s, podemos afirmar que não ouvimos o barulho destas explosões porque:
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A superfície lateral de um cone, ao ser planificada, gera um setor circular cujo raio mede 10 cm e cujo comprimento do arco mede 10!$ \pi !$ cm. O raio da base do cone, em cm, mede
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