Mathematics 10 — Exercise 9.2 · Q3 (i), x

Full question

Cyclic ABCD has A=74°, B=159°. Find x at D.

Step-by-step solution

1. Opposite angles of a cyclic quadrilateral add to 180°.

2. Substitute the given numbers into the formula.

   $$180-159$$

3. Calculate this operation before combining the remaining terms.

   $$180-159=21$$

4. The required result is shown below. Unit: °

   $$21$$

Answer

The final answer is shown below.