I need help on this question

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point

The product of sin 30 degrees and sin 60 degrees is same as the product of