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3 years ago

Trigonometry question

Mathematics

1 answer:

kykrilka [37]3 years ago

6 0

Step-by-step explanation:

I will call the angle A.

we need to use cos, sine, and tangent here

cosine= adjacent over hypotenuse

sine = opposite over hypotenuse

tangent = opposite over adjacent

the angle A has x as the hypotenuse

and y is adjacent to the angle

cosine will be used

cos(A)= adjacent/hypotenuse

cos(A)= 5/x

get x alone by using opposite signs

x and 5 are dividing. the opposite of division is multiplication , but in order to cancel 5 from the right side i need to multiply the reciprocal. 5 is on top, needs to be on bottom to cancel out

cos(A)*(1/5)= 5*(1/5x)

cos(A)/5=(1/x)

flip both sides to get x on top

(5/cos(A))=x

use calculator

and make sue it is in degrees

x=5.8 cm

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Step-by-step explanation:

The total number of CDs = 6500

Number of defective CDs = 110

Number of good CDs = 6500-110 = 6390

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3 years ago

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2 years ago

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myrzilka [38]

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3 years ago

given : AD is ⊥to AB and DC, BC is ⊥ to AB and DC, angle EDC ≅ angle ECD, AD ≅ BC. prove: triangle ADE ≅ triangle BCE

Kamila [148]

Answer:

Hence proved triangle ADE ≅ triangle BCE by Side Angle Side congruent property.

Step-by-step explanation:

Given:

AD ⊥ AB $\&$ CD

BC ⊥ AB $\&$ CD

AD = BC

∴ ∠ A = ∠ B = ∠ C = ∠ D =90°

∠ EDC = ∠ ECD

Solution

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∠ C = ∠ D (given)

Substituting equation 1 and 2 in above equation we get

∠ BCE + ∠ ECD = ∠ ADE + ∠ EDC

But ∠ EDC = ∠ ECD (given)

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AD =BC

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3 years ago

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valentina_108 [34]

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More can be learned about the combination formula at brainly.com/question/25821700

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