Question

Is these cosine or tangent or sine ? I need help with them can somebody tell me the answer to all three

Answer 1

Triangle 1: tangent

Triangle 2: cosine

Triangle 3: sine

Explanation:

First, some definitions before working the problem:

The three standard trigonometric functions, cosine, tangent, and sine, are defined as follows for right triangles:

`sin(\theta)=(opposite)/(hypotenuse)`

`tan(\theta)=(opposite)/(adjacent)`

`cos(\theta)=(adjacent)/(hypotenuse)`

One memorization tactic is "Soh Cah Toa" where the first capital letter represents one of those three trigonometric functions, and the "o" "a" and "h" represent the "opposite" "adjacent" and "hypotenuse" respectively.

The triangle must be a right triangle, or there wouldn't be a "hypotenuse", because the hypotenuse is always across from the right angle.

Triangle 1

For the first triangle, the known acute angle is in the bottom left. The two sides of the triangle that are known or are a "goal to find" are not the hypotenuse, so they are the "opposite" & "adjacent".

Specifically, the side of length "13" is touching the known acute angle AND the right angle, so it is the adjacent side. The unknown side of length "x" is is touching the right angle but is NOT touching the known acute angle, so it is the "opposite" (across from the angle).

Out of "Soh Cah Toa," the part that uses o & a is "Toa". The "T" in "Toa" stands for Tangent. So, the desired function to use for the first triangle is the Tangent function.

Triangle 2

For the second triangle, the known acute angle is in the top left. This time, the "adjacent" side is unknown, labeled as x, so it is the "goal to find" side. The "hypotenuse" is known.

Therefore, the two sides of the triangle that are known or are a "goal to find" are the "adjacent" & "hypotenuse".

Out of "Soh Cah Toa," the part that uses "a" & "h" is "Cah". So, the desired function to use for the first triangle is the Cosine function.

Triangle 3

For the third triangle, the known acute angle is in the top right.

This time, the side (at the bottom) across from the angle (at the top right) is known -- the "opposite" leg. Additionally, the "hypotenuse" is unknown and is our "goal to find" side.

Therefore, the two sides of the triangle that are known or are a "goal to find" are the "opposite" & "hypotenuse".

Out of "Soh Cah Toa," the part that uses "o" & "h" is "Soh". So, the desired function to use for the first triangle is the Sine function.

Answer 2

Explanation:

I assume the question is what trig function do you use to find x? If that's correct then answers, from TOP to BOTTOM, are:

tan

cos

sin