Is tvs scalene, isosceles, or equilateral? the vertices are t(1,1), v(9,2), and s(5,8).
- scalene
- equilateral
- cannot be determined
- isoceles

 (D) isosceles

Step-by-step explanation:

The vertices of the triangle TVS is given as:

T(1,1), V(9,2), and S(5,8).

Now., TV=,

VS= and

ST=

Since, two sides of the given triangle TV and ST are equal, therefore, TVS is an isosceles triangle.

Since, in scalene triangle, all the three sides are unequal, but in this we have two equal sides, thus TVS is not a scalene triangle.

Moreover, In equilateral triangle, all the sides are equal, thus TVS is also not an equilateral triangle.

it would open into a square depending on the type of envelope i’m not sure about the second part