Question

18. Two pairs of parallel segments form the

"pound sign" on your telephone keypad. To find
the measures of all the angles in the pound sign,
how many angles must you measure? Explain.

Answer 1

9514 1404 393

Answer:

1

Explanation:

Where parallel lines cross, all corresponding angles and vertical angles have the same measure. All linear pairs are supplementary. This means that you only need to know the measure of one angle to know them all.

In general, half the angles are congruent obtuse angles, and the other half are their supplementary acute angles.