Four triangles are shown. One side of each triangle lies on a ray, and the triangles are not drawn to scale. Based on these triangles, which statement about x is true?

Choice a :  x= 102 degrees because 180°- (63°+39° ) = 78° and 180° - 78° = 102°

Step-by-step explanation:

Two angles are given as  63° and 39°

To find the third angle we subtract the other two angles from 180°

180°- 63°-39° gives 78°as the third inner angle .

The third angle and the outer angle x lie on the straight line making a total of 180°.

To find x we again subtract the inner angle 78° from 180°.

This gives the value of x to be 102°

180°- 78°=102°

Choice a is the best option.

Step-by-step explanation:

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step-by-step explanation: