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25° : 37,5 = 100° : CD
maka
CD = (37,5 x 100) / 25
CD = 150 cm
25° / 100° = 37,5 / CD
dikalikan silang yaa,,
25 x CD = 100 x 37,5
25 CD = 3750
CD = 3750/25 = 150 cm
:)