Question

An umbrella is made by stitching 12 triangular pieces of cloth of two different colours as shown in the figure, each piece measuring 40 cm, 40 cm and 10 cm. How much cloth of each colour is required
for the umbrella?​

Answer 1

Step-by-step explanation:

Answer

There are 10 triangles, out of which 5 of black and 5 of grey color. Now,

Area of of each cloth=5× area of 1 triangle

Area of triangle=

s(s−a)(s−b)(s−c)

,s=

2

a+b+c

=

2

50+20+50

s=60㎝

∴ar△=

60(60−50)(60−20)(60−50)

=

60×10×40×10

=

6×10×10×4×10×10

=2×10×10

6

=200

6

㎠

Area of each cloth required=(5×200

6

)㎠=1000

6

㎠

Answer 2

Answer:

see the attachment

Step-by-step explanation:

hope it helps you