1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
morpeh [17]
3 years ago
6

Prove the Triangle Proportinality Theorem

Mathematics
1 answer:
Xelga [282]3 years ago
5 0

Answer:

Step-by-step explanation:

Given: DE║BC

To prove: \frac{\text{AD}}{\text{DB}}=\frac{\text{AE}}{\text{EC}}

                Statements                           Reasons

1). DE║BC                                   1). Given

2). ∠1 ≅ ∠4, ∠3 ≅ ∠4                2). Corresponding angles theorem

3). ΔADE ~ ΔABC                      3). AA Similarity theorem

4). \frac{\text{AB}}{\text{AD}}=\frac{\text{AC}}{\text{AE}}                                4). Corresponding sides are proportional

5). \frac{\text{AD+DB}}{\text{AD}}=\frac{\text{AE+EC}}{AE}                   5). Segment addition postulate

6). 1+\frac{\text{DB}}{\text{AD}}=1+\frac{\text{EC}}{\text{AE}}                   6). \frac{a+b}{c}=\frac{a}{c}+\frac{b}{c}

7). \frac{\text{DB}}{\text{AD}}=\frac{\text{EC}}{\text{AE}}                                7). Subtract 1 from both sides

8). \frac{\text{AD}}{\text{DB}}=\frac{\text{AE}}{\text{EC}}                               8). Take the reciprocal of both sides

You might be interested in
What is the translation for 16.5 units right
Alexeev081 [22]
To take 16.5 units from zero to the right on a number line.
3 0
3 years ago
Oliver interviewed 30% of the 9th grade class and 70% of the 10th grade class at his school. Jenny interviewed 75% of the 9th gr
mixer [17]

Answer:

A . 36

Step-by-step explanation:

We are given a total of 176 interviewed by Oliver and a total of 140 interviewed by Jenny. To find how many more 10th graders than 9th graders were interviewed, subtract the totals given

176 - 140 = 36

This is how we came to the answer:

We are given 70% of the 10th-grade and 30% of the 9th-grade with a total of 176 for Oliver.

While we're given 75% of the 9th-grade class and 25% of the 10th-grade with a total of 140 interviewed by Jenny

<u>Oliver's Interviewees</u>

  • 10-graders

Firstly, let's find what the number of 9th-graders was interviewed by Oliver; find the percentage of the 9th-graders by the total;

70% of 176 =

\frac{70}{100} * \frac{176}{1}

Cross multiply

123.2 were 10-graders interviewed by Oliver

  • 9th-graders

Now, to find the number of 9th-graders was interviewed by Oliver; find the percentage of the 9th-graders by the total;

30% of 176 =

\frac{30}{100} * \frac{176}{1}

Cross multiply

52.8 were 9th-graders interviewed by Oliver

<u>Jenny's Interviewees</u>

  • 9th-graders

Firstly, let's find what the number of 9th-graders was interviewed by Jenney; find the percentage of the 9th-graders by the total;

75% of 140 =

\frac{75}{100} * \frac{140}{1}

Cross multiply

105 students were 9th-graders interviewed by Jenney.

  • 10th-graders

Now, to find the number of 10th-graders was interviewed by Jenney; find the percentage of the 10th-graders by the total;

25% of 140 =

\frac{25}{100} * \frac{140}{1}

Cross multiply

35 students were 10th-graders interviewed by Jenney.

<u />

<u>Total calculation</u>

Use the results and sum them up by 9th-grade plus 9th-grade and 10th-grade plus 10-grade. Then subtract the amount gotten from 9th-grade away from the amount gotten from 10th-grade;

Oliver's 9th-grade = 52.8

Jenny's 9th-grade = 105

105 + 52.8 = 157.8

Oliver's 10th-grade = 123.2

Jenny's 10th-grade = 35

123.2 + 35 = 158.2

Total calculation: 158. 2 - 157.8 = 0.4

<h2>Therefore, there are 36 more 10th than 9th.</h2>

<u />

<h3><u>Extra Info:</u></h3>

<u>Oliver's Interviewees Percentage</u>

Since we are given 30% of the 9th-grade class and 70% of the 10th-grade class, first, let's add the percentages. To do so, set it up as a fraction;

30% = \frac{30}{100} while, 70% = \frac{70}{100}

Now solve it;

\frac{30}{100} + \frac{70}{100}

Simplify; cancel bottom zero's;

\frac{30}{1} + \frac{70}{1}

Add the remaining numerators;

30 + 70 = 100

Which is 100%

<u>Jenny's Interviewees Percentage</u>

Since we're given 75% of the 9th-grade class and 25% of the 10th-grade, it will end up the same answer. I'll show you how; first, let's add the percentages. To do so, set it up as a fraction;

25% = \frac{25}{100} and, 75% = \frac{75}{100}

Now solve it;

\frac{25}{100} + \frac{75}{100}

Simplify; cancel bottom zero's

\frac{25}{1} + \frac{75}{1}

Add the remaining numerators;

25 + 75 = 100

Meaning 100%

5 0
3 years ago
Prove that p+q+r=180
allsm [11]
If p=40; q=40 and r=100, p+q+r=180
7 0
3 years ago
Find the distance from point a (7/8, -1/8) to point b (-1/8, 7/8)
VashaNatasha [74]

Answer:

 sqrt(2)    ≈1.414213562

Step-by-step explanation:

Distance is found by the formula

d =sqrt ( (x2-x1)^2 + (y2-y1)^2)

   = sqrt( (-1/8 - 7/8)^2 + (7/8 --1/8)^2)

      sqrt( (-8/8)^2 + (7/8 +1/8)^2)

       sqrt( (-1)^2 + (1)^2)

        sqrt ( 1 +1)

         sqrt(2)  

3 0
3 years ago
A piece of wire 52cm long is cut into two parts , each of the wire is bent to form a square.If the sum of the area of the two sq
Gnom [1K]
Side lengths of the squares are x and y

4x+4y=52
divide both sides by 4 for simlicity
x+y=13


area is 89 so
x²+y²=89

ok

so

x+y=13
minus x both sides
y=13-x
sub that for y in other equation

x²+y²=89
x²+(13-x)²=89
x²+x²-26x+169=89
2x²-26x+169=89
minus 89 both sides
2x²-26x+80=0
undistribute 2
2(x²-13x+40)=0
factor
2(x-8)(x-5)=0
set to zero
x-8=0
x=8
x-5=0
x=5


x=5 or 8

find y

y=13-x
13-8=5
13-5=8


each square has side length of 5 or 8
perimiter is 4 times the area around so
5*4=20
8*4=32

the perimiters are 20cm and 32cm




5 0
3 years ago
Other questions:
  • Where is most of the mass in the universe found
    15·1 answer
  • Estimate the sum 9/10 + 7/8 A.about 0 B.about 1 C.about 1/2 D. about 2
    6·2 answers
  • A card is drawn from a standard deck of 52 cards. What is the probability of drawing a face card (jack, king, or queen) or a bla
    6·1 answer
  • X - 4y + z = 5<br> 4x + 2y + z = 2<br> - 4x + y - 3z = -8
    9·1 answer
  • A. <br> 0.643<br><br> B. <br> 0.933<br><br> C. <br> 0.600<br><br> D. <br> 0.321
    15·1 answer
  • I need help finding the volume and surface area
    9·1 answer
  • How do you write 50% as a decimal?
    9·2 answers
  • -2 + 12/25 enter the answer as an exact decimal
    6·1 answer
  • What is the constant of proportionality what does it mean<br>​
    14·1 answer
  • Need help due in 10 mins
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!