think the ans

Question

think the ans

anonymous · Answer

Have you learnt cosine theorem?

anonymous · Answer

Yes

anonymous · Answer

After this I have some more questions do you have an email if you can give it to me so I could ask the questions I need help with thanks

anonymous · Answer

With 3 sides given, cosine theorem help us computes the angles

anonymous · Answer

Obtuse angles means that c^2 is bigger than sides a and b

anonymous · Answer

Acute angles mean that c Is less than sides a and b and right angles mean that c is equal to sides a and b right ? Pythagorean theorem, just making sure I'm correct

anonymous · Answer

Are you there?

anonymous · Answer

Yeahyeah. Nice observation.
We may deduce it from Cosine Thm too:
cos C = (a²+b²-c²)/(2ab)
It relatea the angle C to what you have mentioned (the sign of numerator)

anonymous · Answer

So obtuse?

anonymous · Answer

Hello?

anonymous · Answer

Obtuse means C>90°, so what should be tbe cos value?  Does it agree with your guessing?

anonymous · Answer

The answer is obtuse?

anonymous · Answer

Help!

misty1212 · Answer

HI!!

misty1212 · Answer

http://www.wolframalpha.com/input/?i=triangle+4,7,8

anonymous · Answer

What is the sign of 4²+7²-8² ?

misty1212 · Answer

the picture should help

anonymous · Answer

Acute ?

misty1212 · Answer

yes

anonymous · Answer

Do you have an email I could contact you in to ask more questions

misty1212 · Answer

$$4^2+7^2-8^2=1$$ a positive number

misty1212 · Answer

so acute

misty1212 · Answer

lol not dear, i do not give you my private email

anonymous · Answer

Oh sorry about that

misty1212 · Answer

i can help you with another one here if you like, but i am not that good with geometry

anonymous · Answer

Triangle side lengths fifteen twenty and twenty five I thin it's right

anonymous · Answer

Could you show the reason?

anonymous · Answer

Question : find the value of x ,diagram is in my profile pic

anonymous · Answer

Btw, a follow-up on the previous one:
Why dont we need to find the signs of
7²+8²-4² and 8²+4²-7²?

anonymous · Answer

I already understand that question, I need more help on more questions

anonymous · Answer

Cannot view your profile picture in mobile... poor network

anonymous · Answer

It's a right trisngle 8 is oj the left and 9 at the bottom of the triangle

anonymous · Answer

Umm based on that, could u apply Pyth Thm directly?