4. Write the missing number under each tick mark on the number line.
18

30

42

Two lines parallel to the same plane are parallel to eachother

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap

The area of a circle is equal to 1 dm². find the radius of the circle.