Find the red angle.
40 degrees
Which trigonometric functions are POSITIVE in the 1st quadrant?
sine, cosine and tangent
Find the red angle.
180 degrees
Is SINE in the 3rd quadrant positive or negative?
negative
Which trigonometric ratios are POSITIVE in the 4th quadrant?
cosine
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
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°)
If you are given the hypotenuse and an adjacent side, which trigonometric function should you use?
cosine
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*
Find the red angle.
-1000 degrees
If <a is = 1 radian, what is the distance of the arc marked "?"
the same distance as radius, 1 unit