The following plane figures are known: 1. Equilateral triangle, 2. Parallelogram, 3. Rectangle, 4. Diamond, 5. Circle Among them, any rotation angle can coincide with its own figure is_____ . The figure that coincides with itself after 120 ° rotation is________ .

The following plane figures are known: 1. Equilateral triangle, 2. Parallelogram, 3. Rectangle, 4. Diamond, 5. Circle Among them, any rotation angle can coincide with its own figure is_____ . The figure that coincides with itself after 120 ° rotation is________ .

The first problem is circle. The second problem is 1 equilateral triangle line and circle. Because an angle of equilateral triangle is 60 degrees, rotation of 120 degrees can of course coincide with each other. Let me explain the circle, because it is surrounded by a curve, no matter how many degrees it rotates, it can coincide with itself

Please use the following plane graphics, two triangles and two circles to design several interesting patterns, and write a sentence respectively

Triangle + triangle + triangle + circle + circle = 78 triangle + triangle + circle + circle + circle = 72 what are triangle circles

Let &; = x, 0 = y, then 3x + 2Y = 78.. (1), 2x + 3Y = 72.. (2)
(1) + (2) get 5x + 5Y = 150, x + y = 30, 2x + 2Y = 60.. (3)
(1) (3) get 3x + 2y-2x-2y = x = 78-60 = 18... X = 18
So y = 30-18 = 12
Therefore, x = 18, y = 12, that is, ｛ 9655; = 18, ｛ 12
Ah, so it is

Triangle + circle = 44 circle + square = 32 square + triangle = 50, what are the triangle circles and squares?
Triangle + circle = 44 circle + square = 32 square + triangle = 50, what are the triangle circles and squares?

△+○=44,①
○+■=32,②
■+△=50,③
（①+②+③）/2,△+○+■=63,④
④-①,■=19,
④-②,△=31,
④-③,○=13.

Square + circle = 91, triangle + square = 63, triangle + circle = 46, how many squares, triangles, circles?

(91+63+46)/2=100
100-63 = 37 --- circle
100-46 = 54 --- square
100-91 = 9 --- triangle

Triangle + square = 57 triangle = square + square ask triangle =? Square =? ()

Triangle + square = 57 triangle = square + square ask triangle = 38 square = 19

Three triangles are equal to five circles, and triangle plus circle is equal to 24?

Triangle: circle = 5 / 3
So:
Triangle = 5 / (5 + 3) * 24 = 15
Circle = 24-15 = 9

It is known that four triangles plus one circle equals 24, and the sum of two circles equals the sum of three triangles

One triangle = 48 / 11
One circle = 72 / 11

If three triangles plus a circle equals 41 and five triangles plus a circle equals 59, then triangle equals () and circle equals ()

59-41=2△
△=9
41=3△+○=27+○
○=14
Triangle equals (9) circle equals (14)

3 circles - 2 squares = 12, 3 squares - 2 circles = 2, how much are circles and squares equal

3 circles - 2 squares = 12, ①
3 squares - 2 circles = 2,
Add 1 circle + 1 square = 14
SO 2 circles + 2 squares = 28
① + 2 5 circles = 12 + 28 = 40
Circle = 40 / 5 = 8
Square = 14 - 8 = 6
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He is a unique talent in the Wulin
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