Question

IN figure , find . the value of x​

Answer 1

Answer:

60°

Step-by-step explanation:

First we need to find the value of y

we know that <DBC+ <CBA = 180°

= 7y + 5y = 180°

= 12y = 180°

therefore y = 180/12 = 15°

Then 5y = 5×15 = 75°

3y = 3×15 = 45°

We know that the Sum of the angles in a triangle is 180°

so x = 180 - (75+45)

= 180 - 120

= 60°

Answer 2

Answer:

x=60°

Step-by-step explanation:

7y+5y=180 (lies on a straight line)

12y=180

y=180/12

y=15

5y+3y+x=180

(The sum of the three angles of a triangle is equal to 180 degrees.)

substitute y

5(15)+3(15)+x=180

75+45+x=180

x=180-75-45

x=60°