NOTE: CHECK THE PHOTO THIS WILL MAKE MORE SENSE. Lenny,Sonja,Jasper, and Willow play instruments in the school orchestra, and th
ey practice every week. •Last week, Lenny practiced for n hours. •Sonja practiced for 3 hours more than Lenny last week. Sonja practiced for 11 hours. •Jasper practiced for 2 hours less than Lenny last week. Jasper practiced for 6 hours. •Willow practiced twice as long as Lenny last week. Willow peaches for 16 hours. Match each person with an equation that represents the number or hours he or she practiced last week. SORRY FOR THE LONG QUESTION!!!
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You need to find the circumference of the whole circular pool and then subtract from it the arc length that is 1/4 of the circumference. The circumference formula is C = (3.14)(d), which in our case is 3.14(40) which is 125.6. Now we need the arc length we need to take away. 1/4 of a circle corresponds to a 90 degree angle, so in the formula for arc length, we have this: 
which equals 31.4. Now subtract that from the circumference of the whole circle and you get the outside of the circle minus that arc length. That's 94.2. But we have to go in the radius times 2 to enclose the pie shaped piece we cut away. So we have 134.2. She should've just stuck with enclosing the circle; she would have used less fencing!