Um quebra-cabeça consiste em recobrir um quadrado com triângulos retângulos isosceles, como ilustra a figura.

Uma artesã confecciona um quebra-cabeça como o descrito, de tal modo que a menor das peças é um triângulo retângulo isosceles cujos catetos medem 2 cm.

O quebra-cabeça, quando montado, resultará em um quadrado cuja medida do lado, em centímetro, é

Para decorar um cilindro circular reto será usada uma faixa retangular de papel transparente, na qual está desenhada em negrito uma diagonal que forma 30° com a borda inferior. O raio da base do cilindro mede 6/p cm, e ao n enrolar a faixa obtém-se uma linha em formato de hélice, como na figura.

O valor da medida da altura do cilindro, em centímetro, é

Pelas expressões do it yourself e How-Tos, entende-se que a pesquisa realizada na página da internet revela uma busca por 

Which skin colour are you? The human swatch chart

that confronts racism

In 1933, in a book called The Masters and the Slaves, the Brazilian anthropologist Gilberto Freyre wrote: “Every Brazilian, even the light-skinned, fair-haired one, carries about him on his soul, when not on soul and body alike, the shadow, or at least the birthmark, of the aborigine or the negro.” This was forefront in the mind of the French artist Pierre David when he moved to Brazil in 2009. “When I was in the streets, I could see so many skin colours”, he says. He decided to make a human colour chart, like one you would find in the paint section of B&Q shop, but showing the gradations and shades of our skin colour. The project, called Nuancier or “swatches”, was first shown at the Museu de Arte Moderna in Salvador – Bahia, and is now on show in his native France. “Brazil has a better attitude to skin colour than other developed nations”, he says. “There's no doubt, because the concept of skin colour difference was recognised very early in their history. Now, it even appears on identity documents.”

Yet Nuancier, David says, is still a critique of racism, in Brazil and around the world. “This work may seem provocative – to classify men by colour, to industrially produce the colour of an individual so it can be store-bought. But this is a demonstration of the commodification of bodies. It denounces racism anywhere it is found in the world.”

SEYMOUR, T. Disponível em: www.theguardian.com. Acesso em: 21 out. 2015 (adaptado).

O artista francês Pierre David, ao evidenciar seu encantamento com a diversidade de cores de peles no Brasil, no projeto Nuancier, também

Monks embrace web to reach recruits

Stew Milne for The New York Times

The Benedictine monks at the Portsmouth Abbey in Portsmouth have a problem. They are aging and their numbers have fallen to 12, from a peak of about 24 in 1969. So the monks have taken to the Internet with an elaborate ad campaign featuring videos, a blog and even a Gregorian chant ringtone. “If this is the way the younger generation are looking things up and are communicating, then this is the place to be”, said Abbot Caedmon Holmes, who has been in charge of the abbey since 2007. That place is far from the solitary lives that some may think monks live. In fact, in this age of social media, the monks have embraced what may be the most popular form of public self-expression: a Facebook page, where they have uploaded photos and video testimonials. Some monks will even write blogs.

MILNE, S. Disponível em: www.nytimes.com. Acesso em: 19 jun. 2012 (adaptado).

A internet costuma ser um veículo de comunicação associado às camadas mais jovens da população, embora não exclusivamente a elas. Segundo o texto, a razão que levou os religiosos a fazerem uma campanha publicitária na internet foi o(a)