Question

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Answer 1

Answer:

647 cm

Step-by-step explanation:

In ΔABC

Take a = 26cm, b = 30cm and c = 28cm

So we get

s=

2

a+b+c

s=

2

26+30+28

By division

s=42cm

We know that

Area=

s(s−a)(s−b)(s−c)

By substituting the values

Area=

42(42−26)(42−30)(42−28)

So we get

Area=

42×16×12×14

It can be written as

Area=

14×3×16×4×3×14

On further calculation

Area=

14×14×3×3×16×4

So we get

Area=14×3×4×2

By multiplication

Area=336cm

2

We know that the diagonal divides the parallelogram into two equal area

So the area of parallelogram ABCD=Area of Δ ABC+Area of ΔACD

It can be written as

Area of parallelogram ABCD=2(Area of ΔABC)

By substituting the values

Area of parallelogram ABCD=2(336)

By multiplication

Area of parallelogram ABCD=672cm

2

Therefore, the area of parallelogram ABCD is 672cm

Answer 2

Answer:

one of the impossible quadrilateral