Trigonometry is based on the right triangle. It is the study of the relationship between the sides and angles of a triangle. The height of a building, tree, tower,width of a river etc. can be determined with the help of trigonometry.There are six trigonmetric ratios:
1.`sin theta` = `P/H`
2.`cos theta`= `B/H`
3.`tan theta`= `P/B`
4.`cot theta`= `B/P`
5.`sec theta`= `H/B`
6.`cosec theta`= `H/P`
If `sintheta`= `7/9`, then find `sectheta`

Options

A. `9/sqrt2`
B. `7/sqrt2 `
C. `9/(4sqrt2)`
D. None

Answer

C