Is SINE in the 3rd quadrant positive or negative?
negative
Which trigonometric ratios are POSITIVE in the 4th quadrant?
cosine
Is TANGENT in the 2nd quadrant positive or negative?
negative
Explain the Thales theorem.
If three points A, B, and C lie on the circumference of a circle, whereby the line AC is the diameter of the circle, then the angle ∠ABC is a right angle (90°)
Which trigonometric functions are POSITIVE in the 1st quadrant?
sine, cosine and tangent
O is the centre of the circle. Find the value of x
Thales circle theorem says <ABC = 90*, so <x = 27*
Can sin, cos and tan be used with ALL triangles?
No, only with right-angled triangles.
