Question

The measure of an angle complement of the angle $70°$ is

• A. $110°$
• B. $290°$
• C. $20°$
• D. $200°$

Answer 1

The correct option is C

$20°$

Let the measure of a complementary angle is $x$

we know that the two angles are complementary if the sum of two angles is $90°$

$$\begin{gathered} \Rightarrow 70+x=90 \\ \Rightarrow 70+x-70=90-70 \\ \therefore x=20° \end{gathered}$$

The measure of an angle complement of the angle $70°$ is $20°$

Hence, option C is correct.