Ex 2.2 answer.pdf

14 Chapter 2 Trigonometric Ratios and Applications of Trigonometry (I)Extra Exercise 2.2Level OneUse a calculator to find the values of the following. (Give the answers correct to 4 decimal places.) EN – PF=NKE~F sin 55° 0.819 2EÄF sin 78° 0.978 1EÅF sin 63° 0.891 0EÇF sin 18° 0.309 0=OKE~F sin 29.5° 0.492 4EÄF sin 33.82°EÅF sin 77.71° 0.977 1EÇF sin 52.87°0.556 60.797 3=PKE~F sin 36°29′ 0.594 6EÄF sin 45°2′30′′EÅF sin 65°58′27′′ 0.913 4EÇF sin 82°17′48′′0.707 60.991 0=QKUse a calculator to find θ in the following. (Give the answers correct to the nearest degree.)E~F sin θ = 0.375 2 θ = 22°EÄF sin θ = 0.125 7 θ = 7°EÅF sin θ = 2 3θ = 24°EÇF sin θ = θ = 35°53=RKUse a calculator to find θ in the following. (Give the answers correct to the nearest minute.)E~F sin θ = 0.982 4 θ = 79°14′ EÄF sin θ = 0.003 4 θ = 0°12′EÅF sin θ = 3 θ = 36°52′5EÇF sin θ = θ = 26°34′55Find the unknown angles in the following. (Give the answers correct to the nearest degree.) ES – UF=SK a = 23° =TK b = 35°=UK c = 64°57b20ca13418