Two lines intersect at a point. the vertical angles formed are supplementary.

we know that

Vertical angles are a pair of opposite and congruent angles formed by intersecting lines.

so

Let

x1> angle vertical 1

x2> angle vertical 2

x1=x2 > equation 1

in this problem

if the vertical angles formed are supplementary

that means that

x1+x2=180 > equation 2

substitute equation 1 in equation 2

x1+x1=180

2x1=180

x1=180/2

x1=90 degrees

therefore

the answer is

The vertical angles are right angles

kk.bj.

step-by-step explanation:

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54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m