Question

find the area of a triangle two sides are 18 cm and 10cm and perimeter is 42 centimetre​

Answer 1

let third side of triangle =a

so ,

a+18+10=42 cm

a+28 =42 cm

a =42-28 cm

so,,, a=14 cm

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Answer 2

Step-by-step explanation:

a = 18 cm

b = 10 cm

c = ?

Perimeter of a triangle =42 cm

a + b + c = 42 cm

18cm + 10cm + c = 42cm

28cm + c = 42cm

c = 42cm - 28 cm

c = 14cm

Semi perimeter = 42/2

= 21cm

Area of triangle =underroot 21*21-18*21-10*21-14

= Underroot21*3*11*7

= 21root11 cm^2.

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