Cjnight17 Cjnight17

02-08-2020
Mathematics

contestada

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

Respuesta :

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

akitiviti yand dijalankan untuk agensi pelancongan?

A={ 0,1,3,5,6}; B={1,2,3,7} draw the venn diagram of AUB Writ

what 1columb=? please help

Richard and Teo have a combined age of 23. Richard is 2 years older than twice Teo's age. How old are Richard and Teo?

Smitville is located between Jonesville and Cityville. Smitville is five times as far away from Cityville as it is from Jonesville. If the distance between Jone

Question 1 of 5 What is the spread of the data? .. . . 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Age of female U.S. Olympic swimmers (years) A

Help me with my French question

Help please thank youuu

WILL PICK BRAINLIEST AND GIVE LOT OF POINTS! The base of a solid S is the triangle enclosed by the line x+y=1, the x-axis, and the y-axis. Cross-sections perpen

what is c² + 6c - 6 if c = 4?