There are two tangram puzzles that can spell a few right angles and a few obtuse angles

Two right angles, three obtuse angles.

Tangram. In addition to the name of "Tangram", there are many names: "puzzle map", "wisdom board", "Tang diagram".

and so on are all other names for tangrams. The tangram consists of five isosceles right triangles (two small triangles, one medium triangle and two large triangles), one square, and one parallelogram.

Compose. The English name of the tangram is "tangram". It is an intellectual toy spread by the Han folk.

It evolved from the banquet table of the Tang Dynasty, which was originally an indoor game of the literati, and later evolved into a puzzle board toy among the people. According to Lu Yiyan's "Leng Lu Miscellaneous Knowledge" in the Qing Dynasty, he said: Song Huang Bosi feasted on a few pictures, with a few square seven, the long sections were coherent, and they were derived into twenty-five bodies, becoming sixty-eight.

A few pictures of the Ming Yan butterfly are adapted to the shape of the Pythagorean to make a triangular phase misshape, such as butterfly wings. Its formula is three, its system is six, its dozens have three, and its changing formula is more than one hundred. Recently, there are tangrams, its formula is five, its number is seven, and its variation is more than a thousand.

The shape of the body and objects, changing at will, and covering the game, is enough to dispel the boredom and break the silence, so the world likes it. ”

Now the tangram is cut into five small Pythagorean shapes by a square, and it is pieced together into various things, such as figures, animals and plants, pavilions, cars, boats, bridges, etc., which can be played by one person or by many people. The use of tangram can elucidate a number of important geometric relationships, the principle of which is the "principle of complementarity in and out" in ancient arithmetic

With two tangrams, you can put together 8 at right angles. Tangram, also known as tangram and wisdom board, is an intellectual toy circulated in Chinese folklore. It evolved from the banquet table of the Song Dynasty, which was originally an indoor game of the literati, and later evolved into a puzzle board toy in the folk.

The tangram is made up of the following seven plates, and the complete pattern is a square: five isosceles right triangles (two small triangles, one medium triangle, and two large triangles), one square, and one parallelogram. One of the most popular puzzles of the nineteenth century was the tangram.

The popularity of tangram is probably due to its simple structure, easy operation, and easy to understand.

Summary. 8 right angles, 3 obtuse angles.

1. First use two acute angles to spell out a right angle.

2. These two acute angles can also be spelled into a right angle.

3. Next, I use a parallelogram and a triangle to spell out an obtuse angle.

4. A right angle and an acute angle can also be spelled together to form an obtuse angle.

5. This obtuse angle is also composed of a right angle and an acute angle.

6. Look at the spelling.

With a tangram, how many right angles and how many obtuse angles can be spelled out with two boards?

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Good. 8 right angles, 3 obtuse angles. 1. First use two acute angles to spell out a right angle 2, these two acute angles can also be spelled into a right angle 3, and then I use a parallelogram and a triangle to spell out an obtuse angle 4, with a right angle and an acute angle can also be spelled into an obtuse angle 5, this obtuse angle is also composed of a right angle plus an acute angle 6, look at the spelling.

8 right angles, 3 obtuse angles.

1. First use two acute angles to spell out a right angle.

2. These two acute angles can also be spelled into a right angle.

3. Next, I'll use a parallelogram.

and a triangle.

Spell out an obtuse angle.

4. A right angle and an acute angle can also be spelled together to form an obtuse angle.

5. This obtuse angle is also composed of a right angle and an acute angle.

6. Look at the blunt angles spelled out.

Tangram: Two boards with right angles and 3 obtuse angles. Tangram is an ancient traditional Chinese intellectual toy, which, as the name suggests, is made up of seven boards. And these seven plates can be put together into many shapes (more than 1,600 types), such as:

Triangles, parallelograms, irregular polygons, players can also put it together into a variety of characters, images, animals, bridges, houses, towers, and so on.

Intellectual toys are toys used to develop young children's intelligence. Including **, cards and a variety of spelling, inserts, sets, inlays and other materials. Among them, there are beads, towers, and projection boxes that train children's hand-eye coordination and finger dexterity; Six-sided puzzles, pattern blocks, and geometric combinations that train children's memory and reaction skills; Solitaire, calculation board, and button chess to help children understand the concept of numbers; Classification boards, checkers, military chess, etc., which develop children's thinking.

Two acute angles can be combined into one acute angle or right or obtuse angle.

The analysis process is as follows:

1) When both acute angles are less than 45°, the two acute angles can only be combined into one acute angle. Reason 0 a 45,0 b.

2) When the sum of two acute angles is equal to 90, the two acute angles can be put together to form a right angle.

3) When both acute angles are equal to 45°, the two acute angles can be combined into an obtuse angle. Reason 45 a 90, 45 b.