Secondary 2 Trignometry Recap

How to find the cosine of an angle

• Adjacent/Hypotenuse

• Opposite/Adjacent

How to find the sine of an angle

• Opposite/Hypotenuse

• Opposite/Adjacent

How to find the Tangant of an angle?

• Opposite/Adjacent

• Adjacent/Hypotenuse

Provided that Sine of R is 69/80,find R round off to 5 significant figures

• 59.598

• 0.01525

In Triangle ABC,Angle ACB is 60 Degrees.AB is 12cm.Find BC,rounded off to 4 significant figures.Let AC be the hypotenuse

In Triangle XYZ,XZ is 15cm and YZ is 10cm.Find Angle XZY,rounded off to 4 significant figures.Let XZ be the hypotenuse.

In Triangle DEF,DE is 18cm and DF is 30cm.Assuming that DF is the hypotenuse, find Angle DFE,rounded off to 4 significant figures

Reyes puts a ladder against a wall. The length of the wall is 15cm.The angle of elevation is 30 degrees. Find the length of the ladder