Question

make an umbrella by pasting 10 triangular pieces of paper of two different colours each piece measuring 10cm 20cm and 20cm.how much paper of each colour is required for the umbrella.​

Answer 1

S = a+b+c/2

S = 10+20+20/2=50/2

S=25

area of ∆= √S(S-a) (s-b)(s-c)

= √25(25-10)(25-20)(25-20)

= √25×15×5×5

= 5×5√15=25√15

10×area of ∆

10×25√15

250√15

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