is a triangle where cm, cm and cm. Find the smallest angle in giving the answer to the nearest second.
The lengths of two sides of a triangle are and and the angle between them is . Find the length of the third side giving the answer in an exact form.
A biker travelled from city to city via city with a uniform speed of 52 km/h. He then returned directly to city with a uniform speed of 89 km/h. Find, in minutes, the total time of his whole journey to two decimal places.