Question

Find a if the measure of c is 89 .

Answer 1

Concept:

The opposite angles of a cyclic quadilateral are supplementary

`\begin{gathered} \angle A+\angle C=180^0 \\ \angle C=89^0 \end{gathered}`

By applying the principle, we will have

`\begin{gathered} \angle A+\angle C=180^0 \\ \angle A+89^0=180^0 \\ \angle A=180^0-89^0 \\ \angle A=91^0 \end{gathered}`

Hence,

The final answer for ∠A =91°

The SECOND OPTION is the right answer