Question and Answers Forum

All Questions      Topic List

Trigonometry Questions

Previous in All Question      Next in All Question      

Previous in Trigonometry      Next in Trigonometry      

Question Number 9709 by tawakalitu last updated on 28/Dec/16

A vertical pole 3m high is 2m south of a wall  which runs directly east and west. The sun  is south west at an elevation of 35°.  Find to the nearest centimeter the height of  the shadow of the pole on the wall.

$$\mathrm{A}\:\mathrm{vertical}\:\mathrm{pole}\:\mathrm{3m}\:\mathrm{high}\:\mathrm{is}\:\mathrm{2m}\:\mathrm{south}\:\mathrm{of}\:\mathrm{a}\:\mathrm{wall} \\ $$$$\mathrm{which}\:\mathrm{runs}\:\mathrm{directly}\:\mathrm{east}\:\mathrm{and}\:\mathrm{west}.\:\mathrm{The}\:\mathrm{sun} \\ $$$$\mathrm{is}\:\mathrm{south}\:\mathrm{west}\:\mathrm{at}\:\mathrm{an}\:\mathrm{elevation}\:\mathrm{of}\:\mathrm{35}°. \\ $$$$\mathrm{Find}\:\mathrm{to}\:\mathrm{the}\:\mathrm{nearest}\:\mathrm{centimeter}\:\mathrm{the}\:\mathrm{height}\:\mathrm{of} \\ $$$$\mathrm{the}\:\mathrm{shadow}\:\mathrm{of}\:\mathrm{the}\:\mathrm{pole}\:\mathrm{on}\:\mathrm{the}\:\mathrm{wall}. \\ $$

Answered by mrW last updated on 28/Dec/16

x=3−(2/(cos 45°))×tan 35°≈1.02 m=102 cm

$$\mathrm{x}=\mathrm{3}−\frac{\mathrm{2}}{\mathrm{cos}\:\mathrm{45}°}×\mathrm{tan}\:\mathrm{35}°\approx\mathrm{1}.\mathrm{02}\:\mathrm{m}=\mathrm{102}\:\mathrm{cm} \\ $$

Commented by mrW last updated on 28/Dec/16

Commented by tawakalitu last updated on 28/Dec/16

God bless you sir. I reall appreiate.

$$\mathrm{God}\:\mathrm{bless}\:\mathrm{you}\:\mathrm{sir}.\:\mathrm{I}\:\mathrm{reall}\:\mathrm{appreiate}. \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com