Can angle prove the congruence of triangle? Why

Can angle prove the congruence of triangle? Why

sure

Triangle congruent proof angle, what else?

Edge, corner, edge, edge

As shown in the figure, the cross section of the tunnel is composed of parabola and rectangle. The length and width of the rectangle are 8m and 2m respectively
As shown in the figure, the cross section of the tunnel is composed of parabola and rectangle. The length and width of the rectangle are 8m and 2m respectively
(1) A freight car is 4m high and 2m wide. Can it pass through the tunnel?
(2) If there is a two-way road in the tunnel and the clearance between vehicles is 0.4m, can the truck pass through?

Let y = ax ^ 2 + BX + C, then 0 = 16A + 4B + C0 = 16a-4b + C4 = CA = - 1 / 4B = 0, so when the analytic formula is y = - 1 / 4x ^ 2 + 4Y = 0, x = 4, which is exactly the same as 8m, when the rectangular bottom is the x-axis, the equation is y = - 1 / 4x & # 178; + 61) ∵ the height of truck is 4m ∵ the height in the parabola is 2M and the width of truck is 2m, only if the parabola formula F (x) is used to replace

Given that f (x) is a quadratic function, if f (x) = 0, and f (x + 1) = f (x) + X + 1, find the expression of F (x)

Let f (x) = ax & sup2; + BX + C
f(x+1)=f(x)+x+1
f(x+1)-f(x)=x+1
f(x+1)-f(x)
=a(x+1)²+b(x+1)+c-ax²-bx-c
=2ax+a+b
That is, 2aX + A + B = x + 1
2a=1 ,a+b=1
The solution is a = 1 / 2, B = 1 / 2
f(0)=c=0
So f (x) = x & sup2 / 2 + X / 2

When k = k, the square of 4x + KX + 1 / 64 is a complete square

Δ = 0, i.e. K & sup2; - 16 / 64 = 0
k=±(1/2)

Calculation (- A2) 3b3-2b * (A3) 2 * - A &; * (- b) 3 * (- a) 2

(-a^2)^3b^3-2b*(a^3)^2*-a⁴*(-b)^3*(-a)^2
=-a^6b^3-2a^6b*+a^6b^3
=-2a^6b

It is known that: as shown in Figure 1, in RT △ ABC, ∠ ACB = 90 °, D is the midpoint of AB, de and DF intersect AC at e, BC at f respectively, and de ⊥ DF
(1) If CA = CB, prove: AE2 + BF2 = ef2; (2) as shown in Figure 2, if Ca & lt; CB, can the conclusion in (1) AE2 + BF2 = ef2 still hold? If yes, please prove; if not, please give reasons

(1) It is proved that: through point a, make am ‖ BC, intersect FD extension line at point m, connect em. ∵ am ‖ BC, ∵ Mae = ∵ ACB = 90 °, ∵ mad = ∵ B. ∵ ad = BD, ∵ ADM = ≌ BDF, ≌ am = BF, MD = DF, de ⊥ DF, ≁ EF = em. ≁ AE2 + BF2 = AE2 + AM2 = em2 = ef2. (3 points)

Why do people say 1 + 1 is equal to 2 and some is equal to 3

1 + 1 equals 2 in the right case and 3 in the wrong case

A rectangular playground is 150 meters long and 90 meters wide. Use a scale of 1:5000 to draw his plan. How many square centimeters is the playground area on the plan?

On the plan, length = 15000 △ 5000 = 3cm
On the plan, width = 9000 △ 5000 = 1.8 cm
Area = 3 × 1.8 = 5.4 square centimeter

A triangle whose sum of two interior angles is less than the third interior angle must be () triangle. A. right angle B. acute angle C. obtuse angle
Choice: the triangle whose sum of two internal angles is less than the third internal angle must be () triangle. A. right angle B. acute angle C. obtuse angle
Please explain why

Because the third inner angle is more than half of the sum of the inner angles
That is more than 90 degrees
So it's an obtuse triangle
So choose C