Inscribed angles (video) | Circles | Khan Academy (2024)

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• hasitak11170

  6 years agoPosted 6 years ago. Direct link to hasitak11170's post “At 0:46, Sal says that "w...”

  At

  0:46

  , Sal says that "we know from the inscribed angle theorem ...."
  What exactly is the inscribed angle theorem? Is there another video somewhere that I missed, because I am doing this mission from the beginning? If not, is there a link somewhere that explains this concept?

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  (43 votes)

  • Glorfindel

    6 years agoPosted 6 years ago. Direct link to Glorfindel's post “The inscribed angle theor...”

    

    The inscribed angle theorem states that the inscribed angle has one half the degree of the central angle that shares the same arc with the inscribed angle. The theorem is explained later in the video.

    Comment on Glorfindel's post “The inscribed angle theor...”

    (15 votes)
• josh

  8 years agoPosted 8 years ago. Direct link to josh's post “Can someone please explai...”

  Can someone please explain? I think I need some help on this.

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  (6 votes)

  • Rohan

    8 years agoPosted 8 years ago. Direct link to Rohan's post “Hey man this theorem is a...”

    Hey man this theorem is also called the double angle theorem. It states that 'the angle subtended by an arc at the center is double of the angle subtended by it at the center'. To put is simply the angle ADC(from the video) is half(1/2) of angle ABC. Hope it make your doubt clear!

    Comment on Rohan's post “Hey man this theorem is a...”

    (6 votes)

    See Also

    9.2: Inscribed angleInscribed angle theorem proof (article) | Khan Academy
• Kyla

  5 years agoPosted 5 years ago. Direct link to Kyla's post “im confused is there a di...”

  im confused is there a different way

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  (4 votes)

  • Elder Fauth

    5 years agoPosted 5 years ago. Direct link to Elder Fauth's post “If you are trying to find...”

    If you are trying to find the blue angle, double the orange angle. If you are trying to find the orange angle, halve the blue angle.

    Hope that helps!

    Comment on Elder Fauth's post “If you are trying to find...”

    (9 votes)
• kaitlyn gormley

  8 years agoPosted 8 years ago. Direct link to kaitlyn gormley's post “i dont understand any of ...”

  i dont understand any of this circle geometry stuff?

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  (4 votes)

  • Anwesha Mishra

    8 years agoPosted 8 years ago. Direct link to Anwesha Mishra's post “hey!! go back and start ...”

    hey!!
    go back and start from the first video and search on the net for more videos
    if u practice more then you will be able to master it

    Comment on Anwesha Mishra's post “hey!! go back and start ...”

    (4 votes)
• lived4adream

  4 years agoPosted 4 years ago. Direct link to lived4adream's post “Don't we actually calcula...”

  Don't we actually calculate the angle using Θ=arc length/radius? As the radius(distance) is doubled (=diameter in that case), initial Θ is multiplied by 1/2.

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  (3 votes)

  • HZWang

    4 years agoPosted 4 years ago. Direct link to HZWang's post “Hi lived4adream, the answ...”

    Hi lived4adream, the answer is no, we don't. The ratio you are talking about is the radian measurement(arc length/radius). Radians are not used for inscribed angles; their purpose is to resemble and serve as a unit of measurement for the central angle derived from the ratio of the arc length of a central angle and the radius of the circle. Besides, in this case, AD and CD are not diameters of circle B. The basis of the inscribed angle theorem is a bit more complicated and different from what you are thinking of.
    Overall, great question!
    Hope you found this helpful and feel free to ask if you have any more questions!
    ~Hannah

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    (4 votes)
• vihaan

  6 months agoPosted 6 months ago. Direct link to vihaan's post “This might be a dumb ques...”

  This might be a dumb question but what are inscribed angles?

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  (2 votes)

  • kubleeka

    6 months agoPosted 6 months ago. Direct link to kubleeka's post “We say an angle is inscri...”

    We say an angle is inscribed in a circle if the vertex is on the edge of the circle, and the legs go through the interior of the circle.

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    (3 votes)
• PI Technology Π

  5 years agoPosted 5 years ago. Direct link to PI Technology Π's post “What is the definition of...”

  What is the definition of inscribed angle ?

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  (3 votes)

  • 𝕐𝕒𝕤𝕙𝕒𝕤 𝕊

    10 months agoPosted 10 months ago. Direct link to 𝕐𝕒𝕤𝕙𝕒𝕤 𝕊's post “An inscribed angle is the...”

    An inscribed angle is the angle formed in the interior of a circle when two chords intersect the same arc.

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    (1 vote)
• Caleb Allen

  7 months agoPosted 7 months ago. Direct link to Caleb Allen's post “this has nothing to do wi...”

  this has nothing to do with the questions in the exercise?

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  (3 votes)
• noormohamed1616

  6 years agoPosted 6 years ago. Direct link to noormohamed1616's post “when he says <ABC he take...”

  when he says <ABC he takes it the way show in the video. my question is, why should we not take the other angle i.e., the greater angles more than 180 one?

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  (2 votes)

  • Khaled Fayed Ghaleb

    6 years agoPosted 6 years ago. Direct link to Khaled Fayed Ghaleb's post “If you refer to 0:15; you...”

    If you refer to

    0:15

    ; you could understand by other way that it is the angle of intersection between the line AB and line BC at the vertex B.

    and by common thinking and stated in this course before we measure the less angle (angle is corner in latin) unless the problem define the opposite

    please refer to https://www.khanacademy.org/math/basic-geo/basic-geo-angle/modal/v/angle-basics

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    (3 votes)
• joshadrian.valdez

  3 years agoPosted 3 years ago. Direct link to joshadrian.valdez's post “How would you know If it'...”

  How would you know If it's an inscribed Angles in the first place?

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  (2 votes)

  • Ash_001

    3 years agoPosted 3 years ago. Direct link to Ash_001's post “An inscribed angle is any...”

    An inscribed angle is anywhere on the circle where 2 secant segments intersect

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    (2 votes)