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 ratios are POSITIVE in the 4th quadrant?
cosine
Find the red angle.
-1000 degrees
Can sin, cos and tan be used with ALL triangles?
No, only with right-angled triangles.
Which trigonometric ratios are POSITIVE in the 3rd quadrant?
tangent
If you are given the hypotenuse and an adjacent side, which trigonometric function should you use?
cosine
If <a is = 1 radian, what is the distance of the arc marked "?"
the same distance as radius, 1 unit
Is SINE in the 3rd quadrant positive or negative?
negative
Find the red angle.
40 degrees
Is TANGENT in the 2nd quadrant positive or negative?
negative
O is the centre of the circle. Find the value of x
Thales circle theorem says <ABC = 90*, so <x = 27*
Which trigonometric functions are POSITIVE in the 1st quadrant?
sine, cosine and tangent
Find the red angle.
180 degrees