Question

Find all the missing elements.Round to the nearest tenth.Сa = 10a аb = 7C = 6bBсАoA = [ ? 1°B = [ ]C = [ 1°Enter

Answer 1

USING COSINE RULE

`\begin{gathered} \text{COS A=}(b^2+c^2-a^2)/(2bc) \\ \\ \text{where a=10, b=7 and c=6} \\ \text{COS A=}(7^2+6^2-10^2)/(2*7*6) \\ \text{COSA =}(49+36-100)/(84) \\ \text{COS }A=\text{ -0.17857} \\ A=\cos ^(-1)-0.17857 \\ A=100.286\approx100.3^0 \end{gathered}`

STEP 2