Introduction to
Trigonometry
,Topics
, Trigonometric Ratios
Q
𝑂𝑝𝑝𝑜𝑠𝑖𝑡𝑒
sin θ = 𝐻𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒
Opposite side (O)
𝐴𝑑𝑗𝑎𝑐𝑒𝑛𝑡
cos θ = 𝐻𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒
θ
sin 𝜃 𝑂𝑝𝑝𝑜𝑠𝑖𝑡𝑒
tan θ = =
cos 𝜃 𝐴𝑑𝑗𝑎𝑐𝑒𝑛𝑡 O Adjacent side (A) P
𝟏 𝐻𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒
i. sin θ i. cosec θ = sin 𝜽 =
𝑂𝑝𝑝𝑜𝑠𝑖𝑡𝑒
𝟏 𝐻𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒
ii. cos θ ii. sec θ = cos 𝜽 = 𝐴𝑑𝑗𝑎𝑐𝑒𝑛𝑡
𝟏 𝐴𝑑𝑗𝑎𝑐𝑒𝑛𝑡
iii. tan θ iii. cot θ = tan 𝜽 = 𝑂𝑝𝑝𝑜𝑠𝑖𝑡𝑒