00:01
Hi, today we are solving the question in which firstly, according to the given figure, x square will be equal to 4 square plus 12 square minus 2 into 4 into 12 into cosque, into cos, 5 to 2 degree according to law of cosines.
00:20
Now solving it from here, so we get it as equals to x square will be equals to 160 minus 59 .10.
00:31
On solving it further we get it as x square is equals to 100 .8928 now taking the square root of x is equals to under root 100 .8928 so it will be equals to 10 .0 centimeters so therefore we get x as equals to 10 .0 centimeter now taking the second one so according to the given figure if we take the second one, so according to the law of cosines, cost theta will be equal to 4 .5 whole square plus 3 .6 whole square minus 3 .7 whole square by 2 into 4 .5 into 3 .6.
01:25
On solving it further, we get it as cost theta is equals to 20 .25 plus 12 .96 minus 13 .69 by 32 .4.
01:46
So from here, on solving it, we get cost theta as equals to 19 .52 by 32 .4.
01:47
So from here, on solving it, we get cost theta is equals to 19 .52 by 32 .4...