Cjnight17
Cjnight17 Cjnight17
  • 02-08-2020
  • Mathematics
contestada

In △ABC,a=11 , b=20 , and c=28 . Find m∠A .

Respuesta :

MathPhys
MathPhys MathPhys
  • 02-08-2020

Answer:

18.4°

Step-by-step explanation:

Use law of cosine.

a² = b² + c² − 2bc cos A

11² = 20² + 28² − 2(20)(28) cos A

121 = 1184 − 1120 cos A

cos A = 0.949

A = 18.4°

Answer Link

Otras preguntas

Write a real world problem for the inequality -3.5 is less than -1.5
Which country suffered the most military deaths in ww2?
Trying to at least find the point slope form of a line
What kinds of similarities were there between the cultures of Nubia ans Egypt?
i need help on number nine. Please answer ASAP this is homework needing to be turned in tommorow.
Pictures of things that as the same sound as net
If a rectangles length is 3 more than 2 times the width and the perimeter is 24. what are the dimensions of the rectangles?
The table shows a proportional relationship. x 2 4 6 8 y 2.8 5.6 8.4 11.2 What is the equation that represents the table? Enter your answer as a decimal . y =
when you use a crowbar to lift a large rock, you are working against the force called
does a larger cube have more mass than a smaller cube