We know that
applying the law of cosines
a² = b²+ c²<span> – 2*b*c*cos(A)
</span>
in this problem
a=?
b=20
c=9
A=90°
so
a² = b²+ c² – 2*b*c*cos(A)
but
cos (A)=0
a² = b²+ c²-----> 20²+9²----> a²=400+81----> a²=481-----> a=√481
a=21.93-----> a=22
the answer is
22
Answer:(5/3,5/3)
Step-by-step explanation: I did the test ;D
That's a <em>rhombus</em>. If it has one interior right angle, then
it's a special case of rhombus known as a "square".
X = 112
See attachment file below.
Hope it helped!
