Answer and Step-by-step explanation:
Triangles angles, when added together, equal 180 degrees.
To find x, we add everything together and equal it to 180. The red box symbolizes that the triangle is a right triangle, and right triangles have 90 degree angles as one of the angles (the red mark).
2x + 15 + x + 90 = 180
Combine like terms
3x + 105 = 180
Subtract 105 from both sides.
3x = 75
Divide each side by 3.
x = 25
x is equal to 25.
As for the triangle, it is a right scalene triangle, because it has a right angle, and the sides are all different sizes, which is what scalene means (when a triangle has different side lengths).
I hope this helps!
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