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

Explain why volcanoes are common in the Ring of Fire.
A rectangular room is four times as long as it is wide, and its perimeter is 70 meters. Find the width of the room.
Evaluate the expression (11/7)(5/3)(3/1)
The length of a rectangular garden is 7 feet longer than its width. The garden's perimeter is 202 feet. Find the length of the garden.
A rectangular room is four times as long as it is wide, and its perimeter is 70 meters. Find the width of the room.
A retired couple invested $6000 in bonds. At the end of one year, they received an interest payment of $396. What was the simple interest rate of the bonds?
one-sixth of a number is 66
A rectangular room is four times as long as it is wide, and its perimeter is 70 meters. Find the width of the room.
Evaluate the expression (11/7)(5/3)(3/1)
Use the following words to write your own poem for your school'S POENTRY COMPETITION--bed-red-head-said-fed--see-bee-free-tea-agree--ship-lip-slip-equip-skip--e