Question

2
Fig. 8.124
8. In Fig. 8.125, the value of x is
(a) 12
(b) 15
(c) 20
(d) 30
(3x + 10°
Fig. 8.125​

Answer 1

from the figure the angle opposite to X is also X because vertically opposite angles are equal.

and the angles (3x+10°) ,X,and right angle are on a straight line

on a straight line complete Angle is 180°

so 3x+10+X+90=180

4x+10=180-90

4x+10=90

4x=80

X=20°

Answer 2

Answer:

ANSWER = 20 (C)

Step-by-step explanation:

90+3X+10+X=180

100+4X=180

4X=180-100

4X=80

X=80/4

X=20