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Burka [1]
3 years ago
8

In triangle ABC, AC=13, BC=84, and AB=85. Find the measure of angle C

Mathematics
1 answer:
Lena [83]3 years ago
8 0

Answer:

90degrees

Step-by-step explanation:

To get the measure of angle C, we will use the cosine rule as shown;

AB² = AC²+ BC² - 2(AC)(BC)cos C

85² = 13²+ 84² - 2(13)(84)cos C

7225 = 169 + 7056 - 2184cosC

7225 - 7225 = -2184cosC

0 = -2184cosC

cosC = -0/2184

cosC = 0

C = arccos0

C = 90degrees

Hence the measure of angle C is 90degrees

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Select the choice which shows all of the diagonals in this polygon and tells how many there are.
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Answer:

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Step-by-step explanation:

If the polygon has n sides, then the number of diagonals the polygon has is

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So for a seven sided figure the number of diagonals would be

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6 0
3 years ago
Read 2 more answers
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Answer:

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3 0
2 years ago
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sineoko [7]

Answer:

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Step-by-step explanation:

Caio comprou uma lembrança para todos os amigos e gastou R $ 12,50.

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3 0
3 years ago
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Step-by-step explanation:

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galben [10]
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