Rcle of radius 10 cm
18 Fig. 3.14 represents a design on the window of
a building. The curved part XY is an arc of a
circle. (The centre of the circle is not Z.)
10 cm
Y
100 cm
120 cm
120 cm
of the area
correct to
z
Fig. 3.14
ceps through
wiper is
answept
The rise of the segmental arc is 10 cm, its span
is 100 cm and IZXI = IZYI = 120 cm.
Calculate, taking a to be 22 where necessary,
a) the radius of the circle
b) the area of the segmental cap, correct to
2 significant figures
c) the total area of the design, correct to
3 significant figures. (WAEC/SSCE]