Refer to the graph. Find the slope of each line

The diagram shows a 7cm by 6cm rectangle based pyramid. all the diagonal sides - ta, tb, tc and td are length 10cm. m is midpoint of rectangular base. work out height mt to 1 decimal place

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

If chord ab is congruent to chord cd, then what must be true about ef and eg?