Answer:
Denote O as center of circle, draw OA, OC.
As property of tangent line from outside of circle (angle OAD = angle OCD = 90 deg):
=> AOC + D = 180
Moreover, angle AOC = 2 x angle B = 2 x 65 = 130
=> D = 180 - 130 = 50 deg
Hope this helps!
:)
Answer:
ds
F = <-y, x> on the semicircle r(t) = <4 cos t, 4 sin t>, for 0<nb
No because all the sides don’t add up to 90 degrees
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