Question

Please help me thank you very much

Answer 1

Question 1:

Let's use the Pythagorean theorem.

`a=12`

`b=15`

`c=20`

If
`c^2\ \textless \ a^2+b^2`, then the angle is acute.
If
`c^2\ \textgreater \ a^2+b^2`, then the angle is obtuse.
If
`c^2=a^2+b^2`, then the angle is right.


`c^2=400`

`a^2+b^2=144+225=369`


`\boxed{c^2\ \textgreater \ a^2+b^2}`

Thus, the angle is obtuse.

Question 2:

Use the Pythagorean theorem.

`a=b=8`

`c=?`

`a^2+b^2=c^2`


`8^2+8^2=c^2`

`c^2=64+64`

`c^2=128`


`c= √(128)`

`c= √(64*2)`

`\boxed{c=8 √(2) }`

That's your answer.
Hope this helps! :)

Answer 2

here u go
1.B obtuse
2. C. 8/2