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Please, I want to take the exam. It's a little difficult to find the formula now
1. Number of copies × Number of copies = total number ÷ number of copies per copy = total number of copies ÷ number of copies per copy = multiple of 2 and 1 × Multiple = multiple ÷ 1 multiple = multiple ÷ multiple = 1 multiple 3. Speed × Time = distance ÷ speed = time distance ÷ time = speed 4. Unit price × Quantity = total price
All mathematical formulas in Senior High School
Multiplication and factorization A2-B2 = (a + b) (a-b) A3 + B3 = (a + b) (a2-ab + B2) a3-b3 = (a-b (A2 + AB + B2)
Trigonometric inequality | a + B ≤ | a | + | B | A-B ≤ | a | + | B | a | ≤ B-B ≤ a ≤ B
|a-b|≥|a|-|b|-|a|≤a≤|a|
Solution of quadratic equation of one variable - B + √ (b2-4ac) / 2a-b - √ (b2-4ac) / 2A
Relationship between root and coefficient X1 + x2 = - B / ax1 * x2 = C / a note: Weida theorem
Discriminant
B2-4ac = 0 note: the equation has two equal real roots
B2-4ac > 0 note: the equation has two unequal real roots
b2-4ac0
Parabolic standard equation y2 = 2pxy2 = - 2pxx2 = 2pyx2 = - 2PY
Side area of straight prism s = C * h side area of oblique prism s = C '* h
Square pyramid side area s = 1 / 2C * H 'square pyramid side area s = 1 / 2 (c + C') H '
Side area of round table s = 1 / 2 (c + C ') l = pi (R + R) l surface area of ball s = 4Pi * R2
Cylindrical side area s = C * H = 2pi * h conical side area s = 1 / 2 * c * l = pi * r * l
The arc length formula L = a * RA is the radian number of the circle center angle R > 0, and the sector area formula s = 1 / 2 * L * r
Cone volume formula v = 1 / 3 * s * h cone volume formula v = 1 / 3 * pi * r2h
Volume of inclined prism v = s'L note: where s' is the area of straight section and l is the length of side edge
Cylinder volume formula v = s * h cylinder v = pi * r2h
Arc length formula and sector area formula··
Arc length formula of sector = 2 * 3.1416 * radius * center angle / 360 = radius * center angle (radian)
Area formula of sector = 3.1416 * radius * radius * center angle / 360 = 0.5 * arc length * radius
Conversion formula of area and arc length: arc length = area / (0.5 * radius)
Arc length formula of expanded view of conical side = 2 * bottom radius * 3.1416 = conical side length * 2 * 3.1416 * sector center angle / 360
Conical side area formula = conical side length * conical side length * 3.1416 * sector center angle / 360
Full area formula of cone = = side length of cone * side length of cone * 3.1416 * sector center angle / 360 + bottom radius * bottom radius * 3.1416
All calculation formulas for arc length and sector area Finding the center angle of arc length In particular, the fan-shaped area seems to have a few
S = area of circle * (angle of circle center / 360)
In a sector, given a radius of 8 and an arc length of 12, the center angle is______ Radian, sector area is __
Center angle α＝ l
r＝12
8＝3
2，
Sector area s = 1
2lr＝1
two × twelve × 8＝48．
So the answer is: 3
2，48．
1 - a formula involved in the book: LAL = L / R R is the radius, A is the center angle and LAL is the absolute value of the radians of angle A L is the arc length and L = R. radian system Q: how does this formula hold? How do I understand? IU doesn't understand?
In the angle, all numbers without the degree mark are radians. In the radian system, especially remember pie. Pie = 3.14 radians = 180 degrees. In this way, you can solve all the problems
1. Use the radian system to prove that the sector area formula s = 1 / 2 LR. Where l is the arc length of the sector and R is the radius of the circle. (the circle area is pie R * r, where pie R is the arc length,)
2. Why is the answer not understood in tan1.5
57.30 degrees multiplied by 1.5 = 89.95 degrees = 85 degrees 57 points (if there is no scale after 1.5, it is radian, which can be expressed in pie, 1.5 = 1.5 / 3.14 * pie, and 180 degrees instead of pie, 57.3 degrees * 1.5 = 57.3 degrees * 1.5 / 3.14 * 180 degrees = 89.95 degrees,
3. Convert - 315 degrees into an angle of 0 to 2 pie plus 2K pie
I don't understand why the answer is - 315 degrees = 45 degrees - 360 degrees = 4 / 4 pie - 2 pie. (change the pie to 180 degrees to get the result)
RELATED INFORMATIONS
- 1. Questions about the radian system of mathematics in Senior High School Why is 1 radian equal to 180 ° / π, and why is 1 ° equal to (π / 180) rad?
- 2. What are the arc length formula and sector area formula
- 3. If the circumference of a sector with a radius of 2 is equal to the arc length of the semicircle, then the center angle of the sector is___ Radian, sector area is _
- 4. It is known that the arc length of an arc is equal to the side length of the inscribed regular triangle of its circle, then the radian number of the center angle of the arc is __
- 5. In a circle, the length of an arc is 6 / 15 of the circumference of the circle. Find the degree of the center angle of the circle opposite the arc Triangle ABC is an equilateral triangle with a side length of 50cm. Draw an arc with points a, B and C as the center and 50cm as the radius, and find the sum of the three arc lengths (Note:
- 6. If a string divides a circle into two arcs of 1:3, the circumferential angle of the string is
- 7. If the radius of circle O is 2, the length of a chord is twice the root sign 3, and the center angle of the chord is
- 8. A chord with a length equal to the radius has a central angle equal to______ Radians
- 9. The arc length corresponding to the center angle of 60 ° is () of the circumference of the circle
- 10. If the length of a chord of a circle is equal to its radius, the degree of the circumferential angle of the chord is () A. 30 ° or 60 ° B. 60° C. 150° D. 30 ° or 150 °
- 11. Conversion of angle and radian What angle is a radian equal to
- 12. Prove the calculation formula of sector area with radian system s = 0.5rl
- 13. Conversion of radian system and angle system Let the radian number of an angle be a and the angle be n degrees, then a (RAD) =?
- 14. There is a road construction brigade to build an arc-shaped curve, whose radius R is 36cm, and the center angle of the arc is 60 degrees, then how many cm is the length of the curve, expressed in π
- 15. The chord length and radius are known. To calculate the arc length, the formula is required
- 16. If the arc length opposite the center angle of 2 radians is 4cm, the area of the sector sandwiched by the center angle is ___
- 17. How to calculate the radius of an arc with known chord length and arch height? Given the chord length and arch height, the formula for finding the radius? Given the arc length and arch height, the formula for calculating the chord length?
- 18. The formula for calculating the center angle of a circle with known arc length and radius of a sector
- 19. What is the volume of a drum with an inner diameter of 9m and a height of 1m? How is it converted? formula
- 20. Conversion formula of angle and radian?