Question

what missing angle would make both complementary?

Explanation:

Step1: Recall the definition of complementary angles

Complementary angles add up to \(90^{\circ}\). Let the missing angle be \(x\). Then \(18^{\circ}+x = 90^{\circ}\).

Step2: Solve for \(x\)

Subtract \(18^{\circ}\) from both sides of the equation: \(x=90^{\circ}-18^{\circ}\).

$$x = 72^{\circ}$$

Answer:

\(72\)