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torisob [31]
3 years ago
9

ABCD is a quadrilateral Work out the length of BC Give your answer to 1 decimal place

Mathematics
1 answer:
Likurg_2 [28]3 years ago
5 0

Answer:

8.1

Step-by-step explanation:

Use Pythagoras to find the length of BD- 7.5^2 +5^2=81.25

The square root of 81.25 is 9.01

BD-9.01 cm

Then use the cos rule to find BC.

c=a2+b2﹣2abcosγ=9.012+132﹣2·9.01·13·cos(38°)≈8.09819(square root)

round to 8.1

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Answer:

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3 years ago
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Nikolay [14]

Answer:

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Step-by-step explanation:

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We do a similar process for sin but sin is equal to opposite/hypotenuse so we can set up the equation y/r=.581 and we simply multiply both sides by 12 to get 12*.581 to get y.

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3 years ago
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Klio2033 [76]
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Hi pleaseuor to meeting you all and have a good day
Rainbow [258]

Answer:

And you too.

thank you.

Am glad for using this app

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