1. The congruence of two right triangles corresponding to the same angle and one side. 2. The congruence of two triangles corresponding to the same angle and one side. Which is the true proposition Please draw a picture to illustrate

1. The congruence of two right triangles corresponding to the same angle and one side. 2. The congruence of two triangles corresponding to the same angle and one side. Which is the true proposition Please draw a picture to illustrate

Mathematical answer group answers for you
All are true propositions
Because they all conform to "corner corner" or "corner edge"
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The ratio of length to width of a rectangle is 7:3. The perimeter of the rectangle is 40 cm. What's the area?

Length 40 ÷ 2x7 ÷ (7 + 3) = 14cm
Width 14x3 / 7 = 6cm
Area 14x6 = 84 square centimeter

If a ball falls from a height of 100 meters, how many meters does it bounce for the third time?

100 × 25 × 25 × 25, = 40 × 25 × 25, = 16 × 25, = 325 (m); answer: the third bounce is 325 M

A 700 meter long train passes a 1400 meter long bridge. The speed of the train is 7 meters per second. How long does it take from the front of the train to the rear of the train?

Through a 1400 meter long bridge
From the front of the car on the bridge to the rear of the car off the bridge
So the time for the front of the car to leave the bridge = 1400 divided by 7 = 200 seconds
The train is 700 meters long
The time for the rear end to leave the bridge = 700 divided by 7 = 100 seconds
Then it takes a total of = 200 seconds + 100 seconds = 300 seconds = 5 minutes from the front to the rear

A rectangle is 5cm in length and 4cm in width. If it is rotated around the width axis to get a three-dimensional figure, what is the volume of the figure

Rotate the solid figure as a cylinder
The bottom radius is 5cm
The height is 4cm
Then the volume v = π R & # 178; × H = 3.14 × 5 & # 178; × 4 = 314cm & # 179;
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What is the result to the power of 3 to the power of 2002 · (1 / 3) to the power of 2000

3 to the power of 2002 · (1 / 3) to the power of 2000 = 3 ^ 2002 * 3 ^ (- 2000)
=3^(2002-2000)
=3^2
=9

A mobile communication company in a city has set up two kinds of communication services: users of global communication pay 50 yuan monthly basic fee first, and then pay 0.2 yuan for each call minute
The users of Shenzhouxing do not pay the monthly basic fee, and they need to pay 0.4 yuan for each minute of the call (here all refer to the city phone). If they talk for X minutes in a month, the fees of the two kinds of call methods are Y1 yuan and Y2 yuan respectively
(1) Write the functional relationship between Y, Y1 and X (i.e. equation)

Y1=X * 0.2 + 50
Y2=X * 0.4
Suppose Y1 = Y2
X*0.2+50 =X*0.4

In quadrilateral ABCD, AB is in line with CD, angle B is equal to angle D, is quadrilateral ABCD a parallelogram? Why?
Please verify with one of the following:
A group of parallelograms whose opposite sides are parallel and equal are parallelograms
A quadrilateral whose diagonals are bisected is a parallelogram

Connect AC and AB to CD
Then ∠ BAC = ∠ ACD
And ∠ B = ∠ D
AC is the public side
So △ ABC ≌ CDA
So AB = CD
So the quadrilateral ABCD is a parallelogram

24 points for 3 ', 4, - 6 and 10

3×[10+4+(-6)]=24
3×(10-4)-(-6)=24
10-4-3×(-6)=24
4-(-6)×10÷3=24

A and B set out from AB two places at the same time and went opposite each other. It is known that the speed ratio of a and B is 6; 5. They first met 12 kilometers away from the midpoint, between ab
How many kilometers apart? Use equations, not unknowns on both sides

At the same time, the speed ratio between a and B is 6; 5, which is the distance ratio
6/11X-5/11X=12X2
1/11X=24
X =264