Question: Tangent Line

Comment on Tangent Line

Can we use the property of central angle is twice the inscribed angle and get the angle 25 degrees and move further?
greenlight-admin's picture

That's a perfectly valid approach. Nice work!

Can I say angle O (angle AOB) is central angle and angle D is a inscribed angle,
So as angle AOB = 50 degree then angle D = 1/2 of 50 degree = 25 degree
greenlight-admin's picture

That's a perfectly valid approach - nice work!

Hi for the above question - initially take angle OBC as 90 as perpendicular then line BD cutting the angle 90 gives two equal halves - 45 so end result can be 45... why cant this be the solutions? please reply me
greenlight-admin's picture

Hi Vineet,

You're right to say that ∠OBC = 90°
However, we aren't told that segment BD cuts ∠OBC into EQUAL angles.
So, we can't assume this to be the case.

Does that help?


hi Brent

it definitely helped me, I have learnt that- we are not supposed to draw conclusions from the diagram, instead we need to put effort in solving the problem with given facts in the question.

Thanks and regards

Have a question about this video?

Post your question in the Comment section below, and a GRE expert will answer it as fast as humanly possible.

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Let me Know

Have a suggestion to make the course even better? Email us today!

Free “Question of the Day” emails!