Question

Johan is an electrician. He has to fix wiring for which he has a 300cm ladder that he leans
up against a wall. The safety sticker on the side of the ladder shows that the bottom must
be placed between 70 cm and 110 cm away from the wall.
Question: What are the minimum distance and maximum distance up the wall that
the ladder can reach?
a) Min: 270cm, Max: 290cm
c) Min: 279cm, Max: 292cm
b)
Min: 275cm, Max: 290cm
d) Min: 275cm , Max: 295cm​

Answer 1

Answer:

Let AC be the electricpole of height 4 m. Let B be a point 1.3 m below the top A of the pole AC.

Then, BC = AC - AB = (4 - 1.3)m = 2.7 m

Let BD be the inclined at an angle of 60∘ to the horizontal.

In ΔBCD, we have 

sin60∘=BDBC

⇒23=BD2.7             [∵BC=2.7m]

⇒BD=32×2.7m=35.4m=35.4×3m

⇒BD=(1.8)3m=593m

Hence, the length of the ladder should be 593m.

Step-by-step explanation:

hope u understand ✌✌❤❤