Question

The equation sin(40)=b\20 can be used to determine the length of the line segment ac. What is the length of ac? Round to the nearest tenth. 11.8cm 12.9cm 14.9cm 15.3cm

Answer 1

Answer: (b)

Step-by-step explanation:

Given

The given equation can be used to determine the length of the line segment AC i.e.

`\Rightarrow \sin (40^(\circ))=(b)/(20)\\\\\Rightarrow b=20\sin (40^(\circ))`

Where,
`b=\text{length of ac}`

`\therefore b=20* 0.642\\\Rightarrow b=12.85\approx 12.9\ cm`

Hence, option (b) is correct.