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A hexagon can be divided into at least several triangles. How many diagonals can be drawn from one of its vertices? As mentioned in the title
A vertex of an n-polygon can be used as (n-3) diagonal lines and can be divided into (n-2) triangles
A hexagon is a vertex that can be used as four diagonals and divided into five triangles
Starting from a vertex of an n-sided shape, you can lead up to several diagonals, which can divide the polygon into several triangles? Such as the title
Article n-3
N-2
The figure composed of three line segments on different lines is called a triangle. It is called the edge of the triangle, and the vertex of the triangle is called the angle of the triangle
The figure formed by the successive connection of the three line segments on different lines is called a triangle
The line segments that make up a triangle are called the edges of the triangle
The common endpoints of adjacent sides are the vertices of the triangle
The angle formed by two adjacent sides is called the inner angle of a triangle
Triangle vertex, edge, angle
There are three vertices, three edges and three corners
From one vertex of a triangle to the opposite edge______ Is the height of the triangle, and the opposite side is the __
The vertical line from one vertex of a triangle to the opposite edge is the height of the triangle, and the opposite edge is the bottom of the triangle
So the answer is: vertical line, bottom
How many angles does a vertex of a triangle lead a line segment to the opposite side? Is it the flat angle between the vertex and the edge? The problem is not rigorous enough
It's not rigorous enough. It's 8, not 6
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- 1. Triangle has______ One edge______ A corner______ A vertex
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- 4. 3 mathematical analysis proof questions! (real analysis, sequence, limit) When n approaches infinity, the sequence Sn / N = non-zero constant C. It is proved that the sequence Sn diverges to infinity The real number equation f is uniformly continuous on R. if FN (x) = f (x + 1 / N), it is proved that the sequence FN is always continuous and tends to F Proof: there is no continuous equation G: R - > R, so that G (x) = C has exactly two solutions (C is any real number) The second question should be: verify that the sequence FN is uniformly continuous and tends to F
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- 18. Gently put a mass m into a container filled with water, and overflow water with mass m from the container, the floating and sinking of the mass in the water is judged correctly as follows: A. If M > m, the block will sink B. If M > m, the block will float up C. If M = m, the mass must be suspended D. If M = m, the mass may be floating I think the question is wrong. D is right. Please give me some advice M> M must sink, but M = m may float or float
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- 20. 1. When a child with a mass of 30kg sits on a 10kg sled, the adult pulls the sled with a pulling force of 100N inclined upward at 37 ° to the horizontal direction to make the sled move at a uniform speed along the horizontal bottom, sin37 ° = 0.6, cos37 ° = 0.8. Find: (1) The pressure of the sled on the ground; (2) The dynamic friction coefficient between sled and horizontal bottom 2. Object a moves in a straight line at a constant speed, with a speed of 2m / s. After a starts for 4S, object B starts from the same place and starts to move in a straight line at a constant acceleration, with an acceleration of 2m / s ², And a and B move in the same direction. Find out (1) how long after B starts to catch up with a (2) the maximum distance before a and B meet 3. There is an object with a mass of 2kg on the horizontal bottom, and the dynamic friction coefficient between it and the bottom is 0.25. Under the action of thrust f inclined downward at 30 ° to the horizontal direction, as shown in the figure, the object makes uniform acceleration from standstill and moves forward 4m within 2S. What is the thrust f? 4. A small block with a mass of M = 2.0kg rushes up the inclined plane with an inclination of 37 ° at a certain initial speed. A student uses a sensor to measure the instantaneous speed of the small block at multiple times in the process of rushing up the inclined plane, and uses a computer to make the V-T diagram line of the sliding process of the small block, as shown in the figure (sin37 = 0.6 cos37 = 0.8 g = 10m / s) ²） Requirements: (1) The acceleration of small blocks when they rush up the inclined plane; (2) Dynamic friction coefficient between small block and inclined plane