Explain How to solve 7/8 x 1/2 equals

Find the value of the variable and the length of each secant segment.

Can someone me and do the problem plz so i can understand it more better

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.