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zalisa [80]
2 years ago
9

a quadrilateral ABCD in which angle DAB is a right angle. AB is 3.3cm, BC is 3.9cm, CD is 5.2cm and DA is 5.6cm. Find the length

of BD and show that angle BCD is 90°​

Mathematics
1 answer:
Greeley [361]2 years ago
5 0

Answer:

Part A) BD = 6.5 cm

Part B) see explanation

Step-by-step explanation:

See the attached figure

Part A) Find the length of BD

ΔDAB is a right triangle at A,  AB is 3.3cm ,  DA is 5.6cm

So, DB is the hypotenuse

Using Pythagorean equation:

DB = √(AD² + AB²) = √(3.3² + 5.6²) = √42.25 = 6.5 cm

===================================================

Part B) Show that angle BCD is 90°​

Given: CD is 5.2cm , BC is 3.9cm  and DB = 6.5 cm

So, CD² = 5.2² = 27.04

BC² = 3.9² = 15.21

DB² = 6.5² = 42.25

So, CD² + BC² = 27.04 + 15.21 = 42.25 = DB²

So, DB represent a hypotenuse at ΔBCD

So, the apposite angle of BD is a right angle

So, ∠BCD = 90°

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3 years ago
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marusya05 [52]

Answer:

The correct answer is: {2,4,6,8}

Step-by-step explanation:

Given sets are:

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We have to find

P∩V

The symbol is used for intersection of two sets. In intersection, only common elements of both sets are written in result.

So,

P∩V = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9) ∩ {2, 4, 6, 8, 10, 12, 14, 16, 18, 20)

P∩V = {2,4,6,8}

Hence,

The correct answer is: {2,4,6,8}

7 0
3 years ago
On a certain hot​ summer's day, 166 people used the public swimming pool. The daily prices are $1.50 for children and $2.00 for
Shalnov [3]

Answer:

134 children and 32 adults.

Step-by-step explanation:

This solution is based on guess and check, I don't know if you know this method but it's used all the time for questions like these.

Or the faster way called assumption, but it is much harder and might get careless easily.

So let's do guess and check.

Predict how much adults and children would be there.

Let's say 76 children and 90 adults.

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Total for first attempt = 180 + 114 = 294

The total amount is too much, so let's lower the number of adults and increase the number of children.

Let's say 85 children and 81 adults.

85 x 1.50 = 127.5

81 x 2.00 = 162

162 + 127.5 = 289.5

Again it's too much.

Let's make it 120 children and 46 adults.

120 x 1.50 = 180

46 x 2.00 = 92

180 + 92 = 272

It's too much but almost there, let's make another one.

140 children and 32 adults.

140 x 1.50 = 210

32 x 2.00 = 64

Too much children, lower it down to 132 children and 34 adults.

132 x 1.50 = 198

34 x 2.00 = 68

198 + 68 = 266

As you can see we're quite close.

134 children and 32 adults.

134 x 1.50 = 201

32 x 2.00 = 64

201 + 64 = 265

So we finally got the answer.

7 0
2 years ago
10 skeins of yarn will make for scars how many scarves can be made with 25 skeins of yarn
zhannawk [14.2K]

Answer:

Step-by-step explanation:

Ten divided by four is 2.5 so you can make obe a rave with 2.5 skeins 2.5*10=25 so you can make ten scarves

4 0
2 years ago
Need help with this question
Andreyy89
By using the exact same method I provided on your last question we get..

1.
y = - 2x + 5

2.
y = 7x - 48
3 0
3 years ago
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