Answer:
x = -3
Step-by-step explanation:
x is -3 in all values so we just write an equation.
Answer:
28, 29, 30
Step-by-step explanation:
Answer:
We use cosine rule also called cosine law which states
c^2=a^2+b^2-2abcosC
given
a=8cm, b=7cm, c=9cm cos C?
9^2=8^+7^2-2*8*7 cos C
expand
81=64+49-112 cos C
like terms together
81-113=-112 cos C
-32=-112cos C
multiply both sides by -1
32=112cos C
divide both sides by 112
32/112=cos C
cosC=0.2857
find cos inverse of 0.2857
angle C= 73.40
Answer:
Step-by-step explanation:
G
1-9 the answer is -8of the circle
