3. The Young Pioneers Brigade made a placard (as shown below). Please work out how much area they used.

The upper part is decomposed into two parallelograms, and the lower part is a rectangle. So 2x0.9x (0.9÷ 2)+0.2x0.8 = 0.97m2 was used.

Slogans not only have accurate and concise stylistic features of official documents, but also have rigorous and inspiring stylistic features of political discourse. They can not only enlighten people intellectually, but also impress people emotionally, shoulder the mission of "social education", play a guiding role in influencing social public opinion and cultural communication, and reflect the essence of social economic system and the degree of social civilization to a certain extent.

One of the few slogans not only embodies the spirit of the times, but also embodies the direction and wisdom of being in power, and its significance and role can not be ignored. However, in recent years, a considerable number of slogans with indifferent sentences and arrogant attitudes have appeared; There are even some slogans that swallow laws, regulations and national policies alive, command coercion and cruel means, which hurt people's feelings and damage the image of the party and the government.

For example: no trampling on the lawn! The ban ... can actually be changed to: the community is my home, and greening depends on everyone (or green grass is the result of your joint efforts, and so on). Then why can't everyone protect the grass?

The slogan itself plays a propaganda role, but how to write it is very particular. Language is the expression of thinking, and slogans are also language. Through the slogan, we can see their thinking orientation. Broadly speaking, slogans can be divided into three categories: signature brand description, slogan brand label, slogan brand slogan, slogan, and advertising language.

In addition, if we distinguish from the occasion and purpose of advertising language, we can classify it like this: product positioning, product promotion, product promotion, brand image, corporate image and so on. In recent years, corporate slogans have developed rapidly, and some companies have invested heavily in professional development, production and sales of such posters and slogans.