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## Answers

heron's formula= √{s(s-a)(s-b)(s-c)}

where, s= {a+b+c}/2

s= {2+12+11}/2

=25/2=12.5m

area= √{12.5(10.5)(0.5)(1.5)}

=9.921 m^2

If the triangle is right angled

then

h = 11

b = 2

area = 1/2xbxh

1/2x2x11

11sq cm

then

h = 11

b = 2

area = 1/2xbxh

1/2x2x11

11sq cm