Each triangular piece in an umbrella is an isosceles triangle with sides 50 cm, 50 cm, 20 cm.
Now, we know that,
Now, Area of triangle
(Since, Heron's formula [area =
Thus, from Equation (i),
Area of each triangular piece
= 2 × 432 cm = 864 cm
Since, there are 10 triangular pieces, out of which 5 & 5 are of different colours.
Hence, total area of cloth of each colour =