81^2 = 18 ^2 + 80^
6561 = 324 + 6400
6561 = 6724
<span>It is not a right angle, since 18^2 + 80^2 does not equal 81^2.
So,
Using </span><span>The law of cosines:
</span>The largest angle C is opposite to the side c.
Therefore,
<span>c^2 = a^2 + b^2 -2ab cosC </span>
<span>Here,
c^2 < (a^2 + b^2)
cosC must be positive which makes C an acute angle.</span>
Answer:
8 lilies and 12 tulips flowers
Step-by-step explanation:
Let x be the lilies and y be the tulips flower.
Given:
Total flowers = 20
Lilies cost = $3
Tulip cost = $2
Bouquet cost = $48
Solution:
A bouquet of lilies and tulips has 20 flowers, so sum of the lilies and tulip flower is equal to 20 flower,
-----------------(1)
Since lilies cost $3 each, tulip cost $2 each and bouquet cost is equal to $48, so we write the equation as.
------------------(2)
From equation 1.
--------------(3)
Substitute
in equation 2 and simplify.





Substitute
in equation 3.


Therefore, 8 lilies and 12 tulips flowers in the bouquet.
Step-by-step explanation:
r = 3 √ 3V / 4π
is the correct answer of this question .