Solve 78 problem 75. The area of a circle is 55.44 cm'. Find its circumference.
76. The radii of the inner and outer edges of a circular running track are 56m and 70 m respectively.
Find. (i) the area of the track, (ii) the difference between the lengths of the two edges of the
track.
77. The area of a circular flower bed is 346.5 A circular path of uniform width 3.5 m runs all
around it, on the outside. Calculate the area of the path.
78. Calculate the area of the shaded part of the figure given below•
79. A wire when bent in the form of a square encloses an area
of 756.25 cm'. Find:
a) the length of each side of the square
b) the length of the wire
c) area enclosed, if the same wire is bent to form a circle
