Find the lateral surface area of the following square pyramid

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

Could someone with number 1 and 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