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2015-11-08T00:37:06+05:30

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AB = 34 cm    BC = 20 cm      AC = 42  cm

s = (34+20+42)/2 = 48 cm

Area of triangle ABC
    = √[s (s-a) (s-b)(s-c) ]
    = 6 * 4 * 14 cm²

Area of parallelogram is twice the area of triangle ABC.

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2015-11-08T16:59:07+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Consider the triangle ABC
AB=34
BC=20
CA=42
=>S=(34+20+42)/2
       =48
remember that area of a triangle=√s(s-a)(s-b)(s-c)
                                             =√48*14*28*6
                                              =336cm²
area of parallelogram=2*336=672cm²
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