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22 votes
22 votes
Help please. this doesn't make sense ​

Help please. this doesn't make sense ​-example-1
User Ssekhar
by
2.8k points

1 Answer

13 votes
13 votes

Answer:

a = 39.2650873379cm

b = 11.5529459767cm

Explanation:

a - Use the area of a triangle equation - 1/2 * a * b * Sin(C)

1/2 * 8 * 10 * Sin(79) = 39.2650873379cm

b - Use the cosine rule - c^2 = a^2 + b^2 - (2 * a * b * Sin(C)

64 + 100 - (2 * 8 * 10 * Cos(79)) = 133.4705607398

c = square root of 6.9396506484 = 11.5529459767cm

Put to however many significant figures / decimal places required.

:)

User Siamsot
by
3.1k points
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