Respuesta :

Answer:  35  (choice C)

Work Shown:

angle1+angle2+angle3 = 180

90+65+(x-10) = 180

x+145 = 180

x = 180-145

x = 35

Explanation:

I'm using the idea that the 3 inside angles of any triangle add to 180 degrees. That's how I got the equation set up. Afterward, we combine like terms. The last step is to subtract 145 from both sides to fully isolate x.

Wallameg000

Answer:

C) 35

Step-by-step explanation:

All triangles have a total of 180 degrees.

Setting Up an Equation

We know that the sum of all angles in a triangle will be 180 degrees. So, we can create an equation that adds all of the angles together, then set this equal to 180.

  • 90 + 65 + (x-10) = 180

Then, we can use this to solve for x.

Finding X

To find x we can isolate the variable. Firstly, combine like-terms.

  • 155 + (x-10) = 180

Then, subtract 155 from both sides.

  • x-10 = 25

Now, add 10 to both sides.

  • x = 35

This means that x = 35. Also, the angles measurements are 90, 65, and 25.

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