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Find A in degrees. Round to the nearest tenth.
a=7
b=4
c=8

A=[?]°​

Find A In Degrees Round To The Nearest Tentha7 B4 C8A class=

Sagot :

Answer:

61 degrees.

Step-by-step explanation:

Use the law of cosine.

In this case, the law of cosine is:

7^2=4^2+8^2-2(4)(8)cos a

Meaning:

7^2-4^2-8^2/-2(4)(8)=.434

Then do the inverse cosine of .434, and it will equal to 61.02

Round to the nearest tenth and you'll get A= 61 degrees.

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