sabaahmed900 sabaahmed900
  • 02-10-2020
  • Mathematics
contestada


a
2
=
b
2
+
c
2
−
2
b
c
cos
A
Evaluate
cos
A
given that
a
=
8
,
b
=
6
and
c
=
7
.

Respuesta :

Erlea
Erlea Erlea
  • 02-10-2020

Answer:

a^2=b^2+c^2- 2bc cosA

64= 36+ 49 - 2(6)(7)cos A

64- 85 = 84cos A

84 cosA= -21

cos A= -21/84

cosA= -0.25

Answer Link

Otras preguntas

Can I get some help solving this please? Thank you!
What is the interest rate on a three-year investment with a future value of $1000 and a present value of $863.84?
Andy is buying a car. He negotiated a 7% decrease on a £6500 car. He will pay the full balance in 12 equal monthly payments. Calculate the amount paid each mont
best ways of how to find common denominators
On the map below, what is the name of the river traveling through the center of Italy
A man is 1.7 m long. an amoeba is 17 µm long. how does the length of the man compare to the length of the amoeba?
Cory finds a leaf that is 5 cm long. Which measurement is equivalent to 5cm
If your target number of calories is 1850 per day to lose weight, but you are consuming 2500 calories per day. Then, your target is to consume what percent of t
The percents of different drinks sold at a snack shop are shown in the circle graph. What percent of the drinks sold were colas? A. 30% B. 32% C. 33% D. 38
Please help on number 13