2 years ago

Use the law of cosines round to the nearest tenths

Mathematics

1 answer:

PtichkaEL [24]2 years ago

3 0

Answer:

x = 11.5

Step-by-step explanation:

Formula

a^2 = b^2 + c^2 - 2*b*c * cos(A) Substitute givens in formula

Givens

b = 31
c = 26
A = 21o
a = x Let a = x to present the formula in it's most normal way

Solution

a^2 = 31^2 + 26^2 - 2 * 31 * 26 * cos(21) Find -2*31*26*cos(21)

a^2 = 961 + 676 -1504.93 Combine

a^2 = 1637 -1504.93 Combine again

a^2 = 132.07 Take the √ on both sides

√a^2 = √132.07

a = 11.5 Rounded.

Answer

x = 11.5

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