an umbrella is made by stitching 6 triangular pieces of cloth red and black each measuring 20 cm,50 cm and 50 cm . how much colour of each cloth is required.
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By using heron formula
area of one triangular piece of cloth=
√s(s-a)(s-b)(s-c)
where s=a+b+c/2. so. 20+50+50/2. =60
√60(60-20)(60-50)(60-50)
=200√6 =490 approx
total pieces of cloth =12(6red and 6 black)
so total cloth required=5880 cm2
area of one triangular piece of cloth=
√s(s-a)(s-b)(s-c)
where s=a+b+c/2. so. 20+50+50/2. =60
√60(60-20)(60-50)(60-50)
=200√6 =490 approx
total pieces of cloth =12(6red and 6 black)
so total cloth required=5880 cm2
fathimaroohee:
how did you get the total cloth required 5880cm2??
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see the attachment
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