Question

Fig. 12.16
E
A floral design on a floor is made up of 16 tiles
which are triangular, the sides of the triangle
being 9 cm, 28 cm and 35 cm (see Fig. 12.18).
Find the cost of polishing the tiles at the rate
of 50p per cm?​

Answer 1

Answer:

Area of tiles = 16 x area of 1 Δ

S=

2

a+b+c

=

2

9+28+35

=

2

72

=36

Area=

36(36−9)(36−28)(36−35)

36×27×8×1

36

6

cm

2

Area of tiles = 16 ×36

6

=1410.20.

Cost of polishing per cm

2

= 50.

Cost of polishing = 1410.90 cm

2

1410.90 x

2

1

705.45