81^2 = 18 ^2 + 80^
6561 = 324 + 6400
6561 = 6724
It is not a right angle, since 18^2 + 80^2 does not equal 81^2.
So,
Using The law of cosines:
The largest angle C is opposite to the side c.
Therefore,
c^2 = a^2 + b^2 -2ab cosC 
Here,
c^2 < (a^2 + b^2)
cosC must be positive which makes C an acute angle.

5 0

3 years ago

Read 2 more answers

Find an equation equivalent to r= 1 + 2 sin thete in rectangular coordinates

noname [10]

Answer:

x^2+y^2=(x^2+y^2-2y)^2

Step-by-step explanation:

Here we are given that

r=1+2sin

we know that the polar cordinates are represented as

x=rsin

y=rcos

Also squaring both and adding them gives you ,

Hence

also r=1+2sin

1+2sin =

Also ,

r = r=1+2sin

also sin =

Hence replacing sin we get

Read more on Brainly.com - brainly.com/question/12858609#readmore

3 0

3 years ago

Tyrell's gross income last month was $2,948.45 he paid 442.45. In pay roll tax for the month. How can you find Tyrell's. Her in

Rufina [12.5K]

B. subtract the payroll tax from the gross income

6 0

2 years ago