=7 \( 7^{2}-122 / \)
\( \angle c= \)
\[
\angle d=\frac{99^{\circ}}{}
\]
a)
b)
\( \left(\frac{0}{2}\right) \)
\[
1810^{2}-73^{3}
\] \( =180^{\circ}-132^{\circ} \)
\[
=\frac{108^{\circ}}{18} \times
\]
\[
=48^{2} V
\]
\( \angle b=48^{\circ}{ }^{\circ} \)
C)
\[
\begin{array}{l}
\left.180^{\circ}-(90) \times 2\right) \\
= 18180^{\circ}-90^{\circ} \\
= 90^{\circ}-99 \\
= 180 \\
= 90^{\circ} \\
\\
\text { Review 3 }
\end{array}
\]