Question

17. Find the area of the polygon ABCDE whose measurements in metre are given in the following figure. 8 10 E C 12 12 8 10​

Answer 1

Answer:

the earth was formed about 4.6 billion if years ago

Answer 2

Answer:

There are three triangles comprising the pentagon

& area of triangle by heron's formula =

s(s−a)(s−b)(s−c)

△

1

a = b = 8 , c = 12

S=

2

8+8+12

=14

△

1

=

14(6)(6)(2)

=6×2

7

△

2

a = b = 12, b = 10

S = 17

△

2

17(5)(5)(7)

=5

119

△

3

a = 10, b = 10, c = 12

S = 16

△

3

=

16(6)(6)(4)

=6×4×2=48

⇒ Total area =48+12

7

+5

119

m

2