Question

35. An umbrella is made by stitching 12
triangular pieces of cloth, each measuring
(50 cm x 20 cm x 50 cm). Find the area of
the cloth used in it.
​

Answer 1

Answer: triangle are formula: 1/2*b*h

    1/2*20*50=500cm^2

as there are 12 pieces of clothes:

12*500= 6000cm*2

Step-by-step explanation:

Answer 2

Step-by-step explanation:

we have that general formula area of the triangle is √s(s-a)(s-b)(s-c)

where S=a+b+c÷2

here 50+50+20÷2=120÷2=60

There fore S=60,

=√60(60-50)(60-50)(60-20)

=√240000

=100√24

here they asked cloth required to make umberlla

for one triangle we got cloth required is

=100√24

for total umberlla =12×100√24

there fore 1200√24 (cm)2 cloth is required