Answer:
13
Step-by-step explanation:
you draw a straight horizontal line from the top of the 15m high line to the part of the 20m line that is even with it. then you draw the line connecting the two tops. omg sudddenly you have a right triangle! say the 20m lines on the left and the 15m is on the right. The shortest line on the left side of the triangle is 5 bc that line is 5 more m than the right line. Then youre like wait i have 2 sides of this triagle now! you can use a²+b²=c², but then youre like wait its a right triangle triple. whenever you have two sides that are multiples of 5 or 12, the hypotenuse will always be a proportional multiple of 13. you gotta memorize these, there are like 5. you GOTTA memorize them if you want to pass geo tbh
