Each exterior angle measure is one eighth the measure of each interior angle PLEASEEE ANSWERRR :'(​

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

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