How is sin 10° = cos 80°??

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

Given that s is the centroid of triangle mno, find sq.