Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

A tree gets broken at a point due to a storm and its top touches the ground at a distance 30 m from the base of the tree with an angle 30° with the gound.  What is the height of the tree?

Options:

45\(\sqrt {3}\)

30 + \(\frac{1}{\sqrt {3}}\)

\(\frac{30}{\sqrt {3}}\)

30\(\sqrt {3}\)

Correct Answer:

30\(\sqrt {3}\)

Explanation:

AB = Tan 30° × BC

AB = \(\frac{1}{\sqrt {3}}\) × 30 = 10 \(\sqrt {3}\)

AC = \(\frac{AB}{Sin\;30°}\) = \(\frac{10\sqrt {3}}{\frac{1}{2}}\)= 20\(\sqrt {3}\)

Height of the tree = AB + AC = 10\(\sqrt {3}\) + 20\(\sqrt {3}\) = 30\(\sqrt {3}\)