Question

Please answer the question no. 55 and question no. 70

Answer 1

hey mate

here is your solution..

(55)-

given: DE||BC

by basic proportionality theorem or Thales theorem,

AD/DB=AE/EC

DB/AD=EC/AE

DB/AD+1=EC/AE+1

DB+AD/AD=EC+AE/AE

AB/AD=AC/AE

Thus,∆ADE is similar to∆ABC

(S.A.S criterion)

thus,

DE/BC=AD/AB

=3.3/(3.3+11)

=3.3/14.3

=3/13

thus,(2) is correct option...

(70)-

the radii will be 11cm and 6cm.

thus,

volume=1/3 *π*h(R²+r²+Rr)

=1/3*π*30(11²+6²+11*6)

=1/3*π*30(121+36+66)

=1/3*π*30(121+102)

=1/3*π*30(223)

=2230π

(4) is correct option..

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