Triangle area formula (in letters) S = (a + b) × 2

Triangle area formula (in letters) S = (a + b) × 2

S = ah / 2, a is the bottom length, h is the height
It's up to you, isn't it
S = (bottom * height) / 2
S=a*b/2
S=1/2absinC=1/2acsinB=1/2bcsinA
S = ABC / 4R (where R is the radius of the triangle circumcircle)
The formula of Helen (P-P) (P-A) is not commonly used
S=1/2a*b
a. B and C represent the three sides of a triangle
a×b÷2
Area = 1 / 2 x bottom x height
S=1/2× a×b
In the arithmetic sequence {an}, the tolerance D
It is also shown that Sn = n (a1 + an) / 2 = 0
SN is a quadratic function of one variable with no constant term about n. now s (0) = s (n), the symmetry axis is n / 2
If n / 2 is an integer, that is, n is an even number, the maximum value is obtained at n / 2; if n is an odd number, the maximum value is obtained at (n + 1) / 2 or (n-1) / 2
It is also shown that Sn = n (a1 + an) / 2 = 0
That is to say, this is a finite sequence. There are n terms in the finite sequence
Let Sn be the maximum when n = I.
Let an ≥ 0, then a1 + (i-1) d ≥ 0
The solution is: I ≥ & frac12; (n + 1)
When n is an even number, the maximum value of Sn is obtained in the first / 2n term
When n is an odd number, then the maximum value of Sn is obtained when the 1 / 2 (n-1) or 1 / 2 (n + 1) term.
It is easy to get that when the nth term, Sn takes the minimum value... To expand
It is also shown that Sn = n (a1 + an) / 2 = 0
That is to say, this is a finite sequence. There are n terms in the finite sequence
Let Sn be the maximum when n = I.
Let an ≥ 0, then a1 + (i-1) d ≥ 0
The solution is: I ≥ & frac12; (n + 1)
When n is an even number, the maximum value of Sn is obtained in the first / 2n term
When n is an odd number, then the maximum value of Sn is obtained when the 1 / 2 (n-1) or 1 / 2 (n + 1) term.
Easy to get, when the nth item, Sn take the minimum value of 0
When the current passes through the superconductor, the voltage at both ends of the superconductor is? 0?
How much heat is produced in a year? How much electricity is consumed
The voltage is 0
Heat production is 0
But there is radiation field (magnetic field), so the power consumption is not zero, according to the specific situation
The area formula of a triangle is written as______ .
The area formula of triangle is: s triangle = 12Ah; so the answer is: s triangle = 12Ah
When the tolerance D of the arithmetic sequence (an) is less than 0 and the square of A1 is equal to the square of A2, the maximum number of terms n of the sequence SN is
If the square of A1 is equal to the square of A2, then A1 and A2 are opposite numbers, tolerance D is less than 0, A1 is positive, A2 and subsequent items are negative, S1 is positive, S2 is 0, and S3 is negative
Therefore, the maximum number of terms n of Sn is 1
If the square of A1 equals the square of A2, then A1 and A2 are opposite numbers. The maximum number of items is 1
Some materials become superconductors when their resistance disappears at low temperature. The voltage at both ends of the superconductor is the heat generated by the electric power consumed by ()
The voltage at both ends of a superconductor is (0) the electrical power consumed 0 the heat generated (0)
How to express the area formula of triangle
Famous teachers help you answer
=(1 / 2) * bottom * height
S = (1 / 2) * a * b * sinc (C is the angle between a and b)
Bottom * height / 2
Bottom x divided by height 2 / 2 (the sine of the length x on both sides)
Circumference of S = 1 / 2 * radius of inscribed circle
S = (1 / 2) * bottom * height
s=(1/2)*a*b*sinC
The sum of the two sides is greater than the third side, and the difference between the two sides is less than the third side
Big corner to big side
Perimeter C = sum of three sides a + B + C
the measure of area
S = 1 / 2ah (bottom * height / 2)
S = 1 / 2absinc (half of sine product of two sides and angle)
s=1/2acsinB
s=1/2bcsinA
S = under the root sign: P (P-A) (P-B) (P-C), where p = 1 / 2 (a + B + C)
This formula is called Helen's formula
Sine theorem:
sinA/a=sinB/b=sinc/C
Cosine theorem:
a^2=b^2+c^2-2bc cosA
b^2=a^2+c^2-2ac cosB
c^2=a^2+b^2-2ab cosA
Two sides of a triangle add more than the third
Bottom area = 2 * triangle
Sum of internal angles of triangle = 180 degrees
Area (upper bottom + lower bottom) × height △ 2
Triangle area = bottom * height / 2
Triangle area formula:
Bottom * height / 2
The sum of the internal angles of a triangle is 180 degrees
OK
H is high, and the rest is the bottom
S=C*1/2h
S is the area, a is the bottom, h is the height,
s=ah÷2
(1 / 2) × bottom x height
S △ = 1 / 2ah (a is the bottom of the triangle, h is the height corresponding to the bottom)
The arithmetic sequence {an} is the tolerance D
S3=a1+a2+a3
S8=a1+a2+a3+a4+a5+a6+a7+a8
Because S3 = S8
So a1 + A2 + a3 = a1 + A2 + a3 + A4 + A5 + A6 + A7 + A8
=>a4+a5+a6+a7+a8=0
Because {an} is an arithmetic sequence
So A4 + A8 = A5 + A7 = 2A6
=>In other words, A6 + A6 = A6 + A6 = A6 + A6
And because of tolerance D
Voltage and power of superconductors
Some materials are superconductors. When the current flows through the superconductor, the voltage at both ends of the superconductor is (), and the power consumption point is ()
Some materials are superconductors. When the current flows through the superconductor, the voltage at both ends of the superconductor is (0) V and the power consumption point is (0) W
infinity
Zero
The letter formula for calculating the area of a triangle is___ .
Suppose that the bottom of the triangle is a and the height is h, then s △ = 12Ah