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Butoxors [25]
3 years ago
13

Cho 4 điểm ABCD thỏa mãn điều kiện AB//CD; AD//BC. Gọi P và Q lần lượt là trung điểm của DC và BC. Gọi M là trung điểm của AB. G

ọi E, F lần lượt là giao điểm của BD với AP và CM; O là giao điểm của AC và BD.
a) Chứng minh O là trung điểm của AC và BD.
b) Chứng minh C, F, M thẳng hàng.
c) Chứng minh DE = EF = FB.
Mathematics
1 answer:
lina2011 [118]3 years ago
4 0

Answer:

i dont even know this language

Step-by-step explanation:

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Simplify each expression.<br>1) -8(k - 4)​
Lera25 [3.4K]

Answer:

<h2>-8(k - 4) = -8k + 32</h2>

Step-by-step explanation:

-8(k - 4)         <em>use the distributive property: a(b + c) = ab + ac</em>

= (-8)(k) + (-8)(-4) = -8k + 32

6 0
3 years ago
Read 2 more answers
5. Identify the starting point(y-intercept) in the table?*
pychu [463]
When y is 0 , what is x? that’s the starting point, i think the answer is 5.5
7 0
3 years ago
I don’t know how to answer the question
OlgaM077 [116]

Let the partitions of the segment be 5k and 3k .
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5k+3k = length of segment
Suppose the length of segment is y
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6 0
3 years ago
You are using extension ladders to paint a chimney that is 33 feet tall. The length of an extension ladder ranges in 1 foot inte
Alexus [3.1K]

Answer:

The ladder has to be 65 feet long to the nearest foot.

Step-by-step explanation:

The height of the chimney from the ground is the sum of the height of the wall and the height of the chimney.

Therefore, the height of the chimney from the ground = (30 + 33) = 63 feet.

Now, the ladder makes a right triangle with the ground and the chimney and the ladder makes an angle of 75.5° with the ground.

Therefore, using trigonometry we can write,

\sin 75.5 ^{\circ} = \frac{\textrm {The height of the chimney from the ground}}{\textrm {Length of the ladder}} = \frac{63}{\textrm {Length of the ladder}}

⇒ The length of the ladder = 65 feet.

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5 0
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