Question

Please Help
(Picture in the comments)

Answer 1

@ganeshie8

Answer 2

do you know the law of cosine what say ?

Answer 3

a^2 = b^2 + c^2 - 2(c)(b)cosA
b^2 = a^2 + c^2 - 2(a)(c)cosB
c^2 = b^2 + a^2 - 2(a)(b)cosC

Answer 4

@jhonyy9

Answer 5

yes so use it for cos theta

Answer 6

I forgot how to solve this kind of equation \[2^{2}=4^{2}+5^{2}-2(4)(5)\cos \theta \]

Answer 7

with what angle will be correspondent from these above wrote angle theta ?

Answer 8

how ?just rewrite it

2*4*5costheta = 16 +25-4 do you can continue it ?

Answer 9

but bc you need findeing 2*4*5 cos theta so just calculi 16+25-4= ?

Answer 10

so the last one is right answer ok ? the 37 - yes ?

Answer 11

ok

Answer 12

was my pleasure

bye bye

Answer 13

Wait, I'm confused

Answer 14

The answer is 37?

Answer 15

yes - just you need check it

Answer 16

I'm confused

Answer 17

what ?

Answer 18

Can you draw it for me please, I'm lost on the process

Answer 19

why ? how ? the law of cosine in a right triangle say that equal the adjacent side divide hypotenuse
so just ise this in case of a non right triangle - ok. ?