A cuboid glass jar is 40 cm long, 30 cm wide and 8 cm deep What is the volume of this stone in cubic decimeter?

A cuboid glass jar is 40 cm long, 30 cm wide and 8 cm deep What is the volume of this stone in cubic decimeter?

Volume = 40 × 30 × (12-8) = 4800 cubic centimeter = 4.8 cubic decimeter

A cuboid glass jar, measuring 40 cm long and 25 cm wide from the inside, with a water depth of 12 cm. Immerse a stone in the water
A cuboid glass jar, measuring 40cm in length and 25cm in width from inside, with a water depth of 12cm. After a stone is immersed in water, the water surface rises to 16cm to calculate the volume of the stone

A cuboid glass jar, measuring 40cm in length and 25cm in width from inside, with a water depth of 12cm. After a stone is immersed in water, the water surface rises to 16cm to calculate the volume of the stone
Stone volume: 40 × 25 × (16-12)
=40×25×4
=4000 (cm3)

The basic idea of solving polar coordinate equation of straight line
Finally, we can explain it with examples
It's the best, not the last.

Let x = ρ cos θ, y = ρ sin θ, and then substitute X and Y into the original equation to calculate ρ = ρ (θ)
For example: (x-3cos30 °) ^ 2 + (y-3sin30 °) ^ 2 = 9
（ρcosθ－3cos30°）^2+（ρsinθ—3sin30°)^2 = 9
ρ（θ）=3√3cosθ+3sinθ

As shown in the figure, ab = AC, ad ⊥ BC at point D, ad = AE, AB bisects ∠ DAE and intersects de at point F. please write out three pairs of congruent triangles in the figure and select one pair to prove it

(1) (2) taking △ ADB ≌ ADC as an example, it is proved that ≌ ad ⊥ BC, ≌ ADB = ≌ ADC = 90 ° in RT ≌ ADB and RT △ ADC, ab = Acad = ad ≌ RT ≌ ADB ≌ RT △ ADC (HL)

How many liters is one ton equivalent to

If it is water, 1 ton = 1000 kg = 1000 L

We know that f (x) = log is based on a (a > 0, a is not equal to 1)

F [(x1 + x2) / 2] = loga (x1 + x2) / 21 / 2 [f (x1) + F (x2)] = 1 / 2 (Loga X1 + loga x2) = 1 / 2 (loga (x1x2) = loga √ (x1x2) x1 ≠ X2, (x1 + x2) / 2 ＞√ (x1x2) when 0 ＜ a ＜ 1, the function is a decreasing function, f [(x1 + x2) / 2] ＜ 1 / 2 [f (x1) + F (x2)] when a ＞ 1, the function is an increasing function, f [(x1 + X

If the waist length of an isosceles triangle is 12 and the area is 36, then the degree of its vertex angle is_____ process

36 = (1 / 2) * 12 * 12 * Sina, Sina = 1 / 2, so the vertex angle is 30 degrees or 150 degrees

It is known that the maximum value of a sinusoidal electromotive force is 220 V, the frequency is 50 Hz, and the initial phase is 300

E = 220 / radical 2 * sin (π / 25 * x + 300)

Set u = 1,2,3,4,5,6, B = 1,4a = 2,3,5, find Cu (AYb) and (CUA) I (cub)

AUB=Φ
So Cu (AUB) = u = {1,2,3,4,5,6}
CuA={1,4,6}
CuB={2,3,5,6}
So (CUA) ∩ (cub) = {6}

Given the line segment CD, extend CD to B so that DB = half CB, extend CD to a reversely so that Ca = CB, if CD = 2cm, find the length of line segment ab

AB＝2×(2×2)
＝8cm
A: the length of line AB is 8 cm