YUP; ISN'T THIS A RIGHT TRIANGLE? AND YOU SEE HOW IF WE KEEP THE SAME ANGLES BUT MAKE THE TRIANGLE BIGGER, THE SIDES ARE STILL THE SAME PROPORTIONS? YUP; SO IN THE REAL WORLD, WE CAN FIGURE OUT ALL KINDS OF HARD-TO-MEASURE STUFF BY PRETENDING IT'S ONE SIDE OF A TRIANGLE, AND THEN MEASURE A DIFFERENT SIDE OF THAT TRIANGLE? MAKES SENSE TO ME; GREAT! YOU UNDERSTAND TRIGONOMETRY; THAT'S IT?