IF U HELP ME U WILL GET POINTS, A STAR AND A THANK YOU AND U WILL ALSO GET BRAINLIST! (MATH)

If the it’s 15cm at the bottom and it’s the ramps you are looking at the ramps would still be 15 cm for the length so A is still 15 cm for answer B u just add 15cm from each ramp so since there is five ramps add 15cm five times and that’s your answer

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Step-by-step explanation: