Question

find the area of triangle having perimeter 20 cm and other two sides are 8cm and 7cm?
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Answer 1

Answer:Area =216cm

Step-by-step explanation:

Let the sides of the triangle be a,b,c

a=8cm,b=7cm

given perimeter=20cm (perimeter= sum of all sides)

a+b+c=20cm

c=5cm

area of the given triangle=

where s= perimeter

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Answer 2

Area =216.33square cm

Let the sides of the triangle be a,b,c

a=8cm,b=7ce

given perimeter=20cm

(perimeter= sum of all sides)

a+b+c=20cm

c=5cm

area of the given triangle

s* (s – a) * (s – b) * (s – c)