Question

Which equations could be used to solve for the unknown lengths of △ABC? Check all that apply.
sin(45°) = StartFraction B C Over 9 EndFraction
sin(45°) = StartFraction 9 Over B C EndFraction
9 tan(45°) = AC
(AC)sin(45°) = BC
cos(45°) = StartFraction B C Over 9 EndFraction

Answer 1

Answer:

the first and last one apply

Step-by-step explanation:

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Answer 2

The equations that can be used to solve for the unknown lengths of △ABC is as follows

sin 45 = BC / 9

cos 45 = BC / 9

Properties of a right angle triangle:

• One of it angle is 90 degrees

• The side and angles of the triangles can be found using trigonometric ratio. The simplest ratios are sine, cosine and tangent.

The ratio are represented as follows:

• sin ∅ = opposite / hypotenuse
• cos ∅ = adjacent / hypotenuse
• tan ∅ = opposite / adjacent

The trigonometric ratios that can be used to find unknown sides is as follows:

• sin 45 = BC / 9
• cos 45 = BC / 9

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