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3 years ago

Maths makes me cry please help me LOL

Mathematics

2 answers:

fredd [130]3 years ago

6 0

To find BC:

• we can see that there is a right angle triangle

• to make it easier use the concept

SOH: Sine° = Opposite/ Hypo

CAH: Cos° = Adjacent/ Hypo

TOA: Tan° = Oppo / Adjacent

(look the CAPITAL letter there, it'll helps us later)

So, we are given: 16 (hypo)

we want to find BC : Opposite

WE HAVE (H) and (O) thefore we use SOH

sine 5° = BC/ 16

(then move 16)

sin 5° x 16 = BC

Answer: 1.3944.. (round off to 3 significant figures)

answer: 1.39m

shtirl [24]3 years ago

3 0

Answer:

i dont see a picture

Step-by-step explanation:

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CaHeK987 [17]

Answer:

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Step-by-step explanation:

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5 0

3 years ago

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Archy [21]

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8 0

3 years ago

If tan theta = 12/5 and cos theta < 0, what is sin theta ?

Talja [164]

1 + tan ² Ф=sec²Ф
1+(12/5)²=sec²Ф
169/25=sec² Ф
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sec Ф=1/cos Ф ⇒cosФ=1/sec Ф
cos Ф>0 ⇔ sec Ф>0 ⇔ sec Ф=+ 13/5

cos Ф=1/secФ
cos Ф=1 / 13/5=5/13

we can calculate the sin Ф, with this method.
sin²Ф + cos²Ф=1 ⇒ sin Ф=⁺₋√(1-cos² Ф)
sin Ф=⁺₋√[1-(5/13)²]=⁺₋12/13
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answer: d.12/13

other method
tan Ф=sin Ф / cos Ф
12/5=sin Ф / 5/13
sin Ф=(12/5)*(5/13)=12/13

answer: d.12/13

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