Schematic diagram of knife lever principle

I don't have a picture. I'll tell you in words!
The first three points of a common guillotine are: 1) the point where the blade rotates but cannot be separated; 2) the place where you put your hand; 3) the point on the blade where the object is cut
① The distance to point 2 is the power arm
① The distance from point 3 is the resistance arm
I've been away from school for a long time. I don't know if that distance is called power arm and resistance arm. I'm sorry,

RELATED INFORMATIONS

1. Distribution and characteristics of climate types in China
2. The positive scale function y = - 1 / 3x must pass through the point? And its image passes through the? Quadrant
3. When x = - 3, y = - 1, which quadrant does the image pass through In addition to the title, there is another question: Point (1 / 2,1). (fill in "on" or "not on") line y = 2x
4. How to draw an image (a straight line) with positive scale function y = 3x It's best to state its steps
5. If the positive scale function y of the image passing through point a (- 2,6) is KX, then K is K
6. What is the degree of the acute angle between the image of positive scale function y = x and X axis______ ．
7. If y is a positive scale function of X and the image passes through points (1,1), then the expression of the positive scale function is?
8. Find the image passing through point (2, - 1) of positive scale function in expression (1) (2) The image of a linear function passes through points (0,4 / 3) and (1 / 2,3) (3) It is known that the ordinate of the intersection of the image and Y-axis of the linear function y = KX + B is - 5, and when x = 1 and y = 2, the expression of the function is?
9. As shown in Figure 1, it is known that the images of positive scale function and inverse scale function all pass through the point m (- 2, - 1), and P (- 1. - 2) is a point on the hyperbola, and Q is the coordinate plane
10. If the point (3,6) is on the image of a positive scale function, the expression of the positive scale function is
11. If the median line of trapezoid is 3 and the height is 2, the area of trapezoid is 2
12. The area of a rectangular desktop is 1 square meter. The side length of a square desktop is 910 meters. How many square meters more is the area of a rectangular desktop than that of a square?
13. Triangle ABC, three sides ABC, 2b = a + C to find the value range of angle B
14. As shown in the figure, ∠ ACB = 90 ° in △ ABC, ad bisects ∠ BAC, de ⊥ AB in E
15. Given a + B = 3 and A-B = - 1, what is the sum of the square of a and the square of B? Thank you very much
16. After adding the same number to the numerator denominator of 9 / 17, the number of fractions equals 3 / 4. What is the number added?
17. That group of acronyms refers to basic knowledge () a.abc b.bbc c.voa
18. In △ ABC, BC = 14, ab = 15. It is known that the area of △ ABC is 84, and the length of AC is obtained What's inside? I won't draw any pictures,
19. In the triangle ABC, BC = a, AC = C, and a = 45 degrees, C = 30 degrees, C = 10cm, find a, B and B!
20. Find the range of function y = sin (2x + π / 3), X ∈ (- π / 6, π)