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Alex_Xolod [135]

4 years ago

13

????????????????????

1 answer:

Arlecino [84]4 years ago

3 0

Answer:

its b

Step-by-step explanation:

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Given: triangle ABC and triangle EDC, C is the midpoint of BD and AE. <br>Prove: AB || DE

VladimirAG [237]

Step-by-step explanation:

1. ΔABC=ΔCDE: a) according to the condition BC=CD and AC=CE; b) m∠(BCA)=m∠(DCE).

2. if ΔABC=ΔCDE, then m∠(BAC)=m∠(DEC) and m∠(ABC)=m∠(CDE).

3. if m∠(BAC)=m∠(DEC), then AB || DE (or if m∠(ABC)=m∠(CDE), then AB || DE).

5 0

3 years ago

the length of a rectangle in (3+√7) and it's with is (1+2√7). what is the area of the rectangle? what is the perimeter of the re

Eddi Din [679]

Answer:

Area: (3+√7) x (1+2√7) = 17+7√7 = 35.52

Perimeter: 2(3+√7) + 2(1+2√7) = 8+6√7 = 23.87

7 0

3 years ago

Pls help! evaluate the sine of the real number, pls give exact answers

solong [7]

Answer:

$-\frac{\sqrt2}{2} \\$ or exact is −0.70710678...

Step-by-step explanation:

Getting the point!

If we look at the unit circle and we find $-\frac{3\pi }{4}$ we see it is in the 3rd quadrant.
We know that all points in the 3rd quadrant have both negative x and negative y values.
We know that all radians with the base of 4 on the unit circle have the points of $(\frac{\sqrt{2}}{2} ,\frac{\sqrt{2}}{2})$
Because we are in the 3rd quadrant and both x and y are negative we know the point of $-\frac{3\pi }{4}$ is $(-\frac{\sqrt{2}}{2}, -\frac{\sqrt{2}}{2})$

Finding the sin!

Because we know that sin is asking us for the y value
We can just look at the point and find the y value!
the y value is $-\frac{\sqrt2}{2} \\$
Because this fraction does not need to be rationalized we are good!
Use a calculator to find the exact value and you get -0.70710678...
The final answer is $-\frac{\sqrt2}{2} \\$ or exact is −0.70710678...

Hope this helps!! Please mark Brainliest!

4 0

2 years ago

Tan x/sec^2 x + tan x/csc^2 x

Arada [10]

I guess you're supposed to simplify?

$\dfrac{\tan x}{\sec^2x}+\dfrac{\tan x}{\csc^2x}$

$=\tan x\left(\dfrac1{\sec^2x}+\dfrac1{\csc^2x}\right)$

$=\tan x(\cos^2x+\sin^2x)$

$=\tan x$

5 0

4 years ago

4(4a 7) 3(2a 5) if the a=5

Anarel [89]

4(4a 7 ) 3(2a 5) = 4 ( 4 x 5 x 7 ) x 3 ( 2 x 5 x 5 ) = 560 x 150 = 84000

3 0

3 years ago