Help please !! thank u

Step-by-step explanation:

Since we know that this triangle is an isosceles triangle, this tells us that the bottom to angles are congruent. So, now we can set up the equation.

(the sum of the interior angles of triangles is equal to 180)

3x + 5 + 3x + 5 + 2x + 4 = 180

Combine like terms.

8x + 14 = 180

Subtract 14 from both sides, the divide by 8 on both sides.

x = 20.75

Now, plug in 20.75 for x to find measure A.

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

the first one, all those points on the line just make a strait line.