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3 years ago

Ismail tried to prove that sin(θ) = cos(90°− θ) using the following diagram. His proof is not correct.

Mathematics

1 answer:

Anton [14]3 years ago

5 0

Answer:

C. Ismail used the wrong sides in his ratio for cos (90 - θ)

Step-by-step explanation:

All steps correct apart from:

cos (90° - θ) = AC/BC

It should be

cos (90° - θ) = AB/BC

Correct choice is C

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Line l and line m intersect. Prove: ∡1 ≅ ∡3

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1 year ago

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A piece of cardboard measures 10 ft by 10 ft. Four equal squares of size x are removed from the corners. After removing the squa

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Answer:

The value of x would be $\frac{5}{3}$

Step-by-step explanation:

Given,

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∵ After removing four equal squares of size x ( in ft ) from the corners,

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Length = ( 10 - 2x ) ft,

Width = ( 10 - 2x ) ft,

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$\implies 3x^2 - 20x + 25=0$

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