As the sides shown are same so the base of large triangle is double the base of smaller triangle
That is
2(3x-8) =20
Divide both sides by 2
3x-8 = 10
Add 8 to both sides
3x =18
Divide both sides by 3
x=6
So answer is 6.0
For which one, and are you just finding the volume
2 is 60, 1 is 60, 3 is 55, 4 is 120
Answer:

Step-by-step explanation:
Given:
The triangle is shown below.
We know that the sum of all interior angles of a triangle is equal to 180°.
Therefore,

Now, plugging the value of 'x' in each angle measure and determining its values. We get:

Therefore, the value of 'x' is 36° and the measure of the three angles are 36°, 71° and 73°.
Answer:
Step-by-step explanation:
x+114=180 degree(being co interior angle)
x=180-114
x=66
therefore the value of x is 66 degree