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saw5 [17]
3 years ago
6

PLS HELP ME ON THIS!!

Mathematics
1 answer:
slamgirl [31]3 years ago
7 0

Answer:

Step-by-step explanation:

DC = AD

DC = 8.5

By the Parallelogram opposite sides theorem

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Divide 54 books between A and B in the ratio 13:14​
Ludmilka [50]

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hi

Step-by-step explanation:

i think,

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3 0
3 years ago
Question 72 true or false
nalin [4]

Answer:

True

m∠T = 40.4°

Step-by-step explanation:

We know all the sides of the triangle but we do not know any of its angles.

To find out if the angle T = 40.4 ° we use the cosine theorem.

According to the cosine theorem:

c^2=a^2 +b^2-2abcos(\alpha)

Where \alpha is the angle between a and b.

In this case:

\alpha = T\\\\a= 11\\\\b=13\\\\c= 8.5

Then we clear α from the formula and verify that it is equal to 40.4 °

8.5^2 =11^2 + 13^2 -2(11)(13)cos(\alpha)\\\\8.5^2 -11^2 - 13^2= -2(11)(13)cos(\alpha)\\\\-8.5^2 +11^2 + 13^2= 2(11)(13)cos(\alpha)\\\\\frac{-8.5^2 +11^2 + 13^2}{2(11)(13)}=cos(\alpha)\\\\\alpha=arcos(\frac{-8.5^2 +11^2 + 13^2}{2(11)(13)})\\\\\alpha = 40.4\° =T

6 0
3 years ago
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