Question

4. In the given figure the value LBDE =?a. 25 b.40 C. 50° d. 30°​

Answer 1

Answer:

We know the sum of all the three angles of triangle=180°

So in triangle ABC the value of angle B will be

40+90+angleB =180°

130+angle B=180

AngleB=180-130

=50°

In Triangle BDE

AngleB+AngleD+AngleE=180°

50+angleD+100=180

150+AngleD=180

AngleD=180-150

=30°

So the correct answer is option d)30°