Trigonometry

• Trigonometry is the branch that deals with the angles and sides of a triangle
• Trigonometry is a tool use for measuring distances that cannot be directly measured
• Trigonometry involves the study of angles and geometric ratios
• Equilateral Triangle has equal sides and equal angles since it is also equiangular
• Oblique Triangle is a triangle which does not contain any right angle
• Hypotenuse is the opposite side of the right angle and the longest side of a triangle
• Opposite side is the opposite side of an angle
• Adjacent side is the side which also a side of an angle
• Line of sight is an imaginary line that connects the eye of the observer to the object being observed
• Angle of Elevation is looking at the object above
• Angle of Depression is looking at the object below
• 45°-45°-90° is a special triangle which is also known as the isosceles triangle
• 30°-60°-90° is when the length of the hypotenuse is twice the length of the shorter leg, and the length of the longer leg is √3 times the shorter leg
• 40°-55°-85° is an acute triangle
• 40°-50°-90° is a right triangle
• 20°-60°-100° is an obtuse triangle
• 64°-25°-91° defines a triangle
• 62°-58°-60° defines an oblique triangle
• Hypotenuse= shorter leg • 2
• Longer leg= shorter leg • √3
• Shorter leg= Hypotenuse/2
• Shorter leg= Longer leg/√3
• Hypotenuse= Leg • √2
• Leg= Hypotenuse/√2