Solving triangle in unit circle | Trigonometry

Solving triangle in unit circle | Trigonometry | Khan Academy

Рет қаралды 363,480

10 жыл бұрын

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Пікірлер: 16

@Wondermultiverse 10 жыл бұрын

intriguing and interesting. However not fascinating (nerdy spock reference).

@remiperon5571 7 жыл бұрын

Incredibly well explained 👌

@giack6235 2 жыл бұрын

question: if we want to define the cosine of the angle in B, do we have to define another goniometric circle centered in the B vertex?

@xVoidCypher 5 ай бұрын

Where can I find a more indepth view of the concept covered here around the Pythagorean theorem, I am struggling like crazy with that.

@camcoburn19 2 жыл бұрын

cos and sin seem to be calculated as a ratio i.e. sin 0 = opposite length/hypotenuse length. Why is he using the length of the sides here?

@AkashBhardwaj97 10 жыл бұрын

Its a 45-45-90, or a pi/4-pi/4-pi/2. so 1/sqrt(2). We don't have to go through the whole pythagorean theorem

@tobiadedoyin811 3 жыл бұрын

An easier method is; Since we know π/2 is 90 deg then π/4 will be 45 deg. Explanation:- π/2 = 90(cross-multiply) π = 180 π/4 = 180/4 - 45 deg.

@JihadAlAnsari 8 жыл бұрын

5:47 is where I got lost.. can someone help?

@drpen3905 7 жыл бұрын

Dittos here, I'm severely lost as well and have been struggling with this topic for many hours. While I admire this guy's teaching ability, he just fails in clarifying this particular detail.

@uncouple 7 жыл бұрын

That's because he explained it in previous videos. Watch www.khanacademy.org/math/algebra2/trig-functions/unit-circle-definition-of-trig-functions-alg2/v/unit-circle-definition-of-trig-functions-1 to learn about the unit circle

@tiramisumandeln 10 жыл бұрын

he sounds tired

@bisacool7339 8 жыл бұрын

how did he get 4pi-2pi-pi/4?

@yosefkap 6 жыл бұрын

he gave all terms a common denominator of 4... then do the each numerator whatever u do to each denominator , to get 4 below

@user-hx2vm7xw4v 4 ай бұрын

Too easy for Chinese😂

@crackerjack3522 4 жыл бұрын

You need to stop repeating yourself, it's really annoying and I got it the first time you said it. If I needed to re-hear it I would turn back the video.

@michael_0618 3 ай бұрын

what about the people who dont get it? there's some people who cant grasp the concept as easy as you can, so it would be nice if you ignored the reiteration. after all, its just a 7 minute video, right? 😊