There are six points on a circle, how many line segments? How many triangles?

There are six points on a circle, how many line segments? How many triangles?

6*5/2=15
6*5*4/3=40

1. A triangle is made up of three line segments. Right
2: A triangle is made up of three line segments. Right

The composition is right, the composition is wrong! The three lines of space may not form a triangle! But the triangle must be composed of three lines. This question is too literal!

A triangle consists of several line segments

Three

Two circles, two triangles and two line segments form a graph (two),

1. Two electric lights, 2. A tree, a round moon hanging in the sky, 3. Chemical flasks and 4. Teapots

Use two triangles, two circles and two line segments to form a picture and have a nice name

Two triangles form two mountains, and in the middle there is a river composed of two lines. A circle above represents the moon, and a circle below represents the shadow of the moon. Its name is "a bright moon shines on Kyushu."

A, which is not a symmetrical figure, has two triangles with equal internal angles, and B has a right triangle with an angle of 45 degrees
Maybe not at all

They are all axisymmetric
If two triangles with equal internal angles, the opposite sides of the two equal internal angles are equal, the figure is an isosceles triangle, and the straight line of the height on the bottom edge is the axis of symmetry
One angle is 45 degree right triangle, the other angle is 45 degree, the figure is isosceles right triangle

If a right triangle is an axisymmetric figure, what are the degrees of its three internal angles?

90 degrees
45 degrees
45 degrees

There is a triangle whose three internal angles are not equal. The smallest angle is 45 degrees. This triangle is ()
1 acute triangle
2 right triangle
3 obtuse triangle

It can only be an acute triangle, if the other angle is more than 45 degrees, then there must be one left

A scientific and technological innovation group has made an instrument to directly measure the resistance value, which is called ohmmeter. The circuit is shown in the figure below (1) Connect wire between a and B, adjust sliding rheostat R1 to make current indication number 0.6A (full scale), mark "0.6A" scale line of ammeter as "0 Ω"; (2) keep sliding rheostat R1 unchanged, when connecting a resistance of 60 Ω between AB, current indication number is 0.3A. At this time, the effective resistance value of sliding rheostat R1 is______ (3) according to this principle, the scale of the ammeter can be changed to the corresponding resistance value by calculation, then the resistance value marked at the scale of the ammeter "0.2A" is______ (4) the ohmmeter can be used to directly measure the resistance of the conductor connected to ab. please write down the two differences between the scale of the ohmmeter and the scale of the ammeter______ 、______ ．

(2) Let the voltage of power supply be u. according to Ohm's law, I 1 = ur1, i.e. 0.6A = ur1 ----- 1, I 2 = ur1 + R, i.e. 0.3A = ur1 + 60 Ω -------- 2, u = 36V, R1 = 60 Ω from 1 2. (3) when the current is I3 = 0.2A, I 3 = ur1 + R ′ = 36v60 Ω + R ′ = 0.2A, R ′ = 120 Ω

In "circle, isosceles triangle, right triangle", it is not necessarily axisymmetric______ ．

According to the concept of axisymmetric figure, circle and isosceles triangle must be axisymmetric figure, while right triangle is not axisymmetric figure