brennarfa
15.01.2021 •
Mathematics
What is the length of side c if side A is 7 and side b is 9 and angle c is 79
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Ответ:
C is approximately 10.3
Step-by-step explanation:
To get the length of c, we use the cosine rule
This is;
The square of the missing side is equal the sum of the squares of the other sides minus 2 multiplied by the product of the two other sides and the cos of the angle facing the missing side
We have this as;
c^2 = 7^2 + 9^2 - 2(7)(9) * Cos 79
c^2 = 49 + 81 - 126 cos 79
c^2 = 130 - 24.042
c^2 = 105.96
c = √105.96
c = 10.29 which is approximately 10.3
Ответ:
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Step-by-step explanation:
have a wonderful day