trigonometry part 4 mind blowing tricks to solve ECAT problems in few seconds

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00:00If circum radius of equilateral triangle is 10 cm, then measure of its in radius.

00:07See, a big trick is to show that in radius and circum radius is 1 to 2.

00:14Now, if this circum radius is 10, then what will it be? Half, or 5.

00:19So, the triangle, the in center of triangle lies in side triangle and its radius is 3 cm than side of equilateral triangle.

00:35So, in radius of the formula, when equilateral triangle is a upon 2 root 3,

00:41you have to give a 2 root 3, so 2 root 3 is multiplied by equilateral side, 6 root 3.

00:48If circum radius of triangle lies outside, it then triangle is called obtuse.

01:03If the circum radius of triangle lies outside, it then triangle is called obtuse.

01:06If inside of triangle lies on vertex, then it is called.

01:16If the circum radius of triangle lies in vertex, then it is called right triangle.

01:19This is the same way.

01:20This is the same way.

01:21If the circum radius is drawn on the base of triangle, it is half of its base.

01:28The triangle will be right triangle.

01:31The equidistance point from the vertices of the triangle is called is.

01:37This is the circum circle.

01:39Now, this is the criterion and then circum circle hakoda ham concept of a circum circle perilous.

01:44Capital R transforms into a bc upon 4 area,

01:47Wait a minute.

01:49If one executor is with triangle equilateral tower,

01:51then ABC one is cl alternate.

01:54Then, of course, a cube has will move around.

01:57And if the triangle, the vertical cycle will come on and the area.

01:58So, at centre of square root 3 node is root 3 upon 4 a square,

02:02so what will happen

02:044 4 cut

02:06a cube and a square cut

02:08a upon root

02:10a upon root

02:12this formula

02:14capital R

02:16capital R

02:18circle radius

02:20triangle

02:22circle

02:24triangle

02:26in radius

02:28in radius

02:303

02:32side

02:343

02:362

02:382

02:402

02:42root

02:44root

02:46root

02:48root

02:50root

02:52root

02:54root

02:56root

02:58root

02:59root

03:01root

03:03root

03:05root

03:06root

03:07root

03:08root

03:09root

03:10root

03:11root

03:12root

03:13root

03:14root

03:15root

03:16root

03:17root

03:18root

03:19root

03:20root

03:21root

03:22root

03:23root

03:24root

03:25root

03:26root

03:27root

03:28so area of equilateral triangle formula root 3 upon 4 side square well well well

03:37equal value how many are 10 10 square is 100 100 to 4 divided by 25 answer

03:45your answer is 25 root 3 and how do you give option a 25 root 3

03:49b 43 point 3 c both a and b and b

03:54and b

04:11sharp part of graph of y equal to sin to x is shown what are the

04:17the coordinates of point b point b is question

04:21from diagram it is clearly see

04:24that the y coordinate is 1

04:26point b

04:28y1

04:29you can't have options

04:30which are y1

04:31or a, b, c

04:33y is equal to sin to x

04:36x will be the value

04:38which will be y1

04:39so who will come from?

04:42pi by 4

04:42pi by 4 is 45

04:442 is 90

04:46sin 90 is 1

04:48answer is 1

04:49to correct answer

04:51option c

04:52iscribe radius

04:54iscribe radius

04:56or e circle

04:58radius

04:58actually

05:00triangle

05:01and this triangle

05:03is the circle

05:04which is the same

05:05r1

05:07area upon s

05:08minus 1

05:08r2

05:09area upon s

05:10minus 1

05:11r3

05:12area upon s

05:13minus c

05:13well

05:15if the three

05:16sides are equal

05:17then

05:18area

05:18root 3

05:19upon 4

05:20square

05:20and s

05:21is equal to 3

05:22upon 2

05:22so r1

05:25r2

05:25r3

05:25is equal to

05:26s minus a

05:28is equal to 1

05:29upon 2

05:29and area of course

05:31root 3

05:31upon 4

05:32square

05:32and finally

05:33root 3

05:34upon 2

05:35a

05:35e radius

05:37a

05:37value

05:38is equal to

05:39root 3

05:40upon 2

05:40multiply

05:41this is

05:41e radius

05:42this is

06:121

06:13and

06:141

06:15and

06:16問題

06:16it is

06:191

06:211

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06:221

06:231

06:251

06:261

06:271

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