Question

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

Answer 1

Answer:

area if triangle is 42 cm and 18

perimeter is 10 cm

Step-by-step explanation:

after do your self

Answer 2

Perimeter of triangle = 42

two sides are 18 and 10 cm

lets find third side

third side = perimeter - sum of 2 sides

= 42 - ( 18+10)

= 42 - 28

= 14 cm

So three sides are 18,10,14

Now area

Let's find semi perimeter = 42/2 = 21

So area = √( s( s-a)( s-b)( s-c))

where s is semi perimeter

a,b,c are 3 sides

Area = √( 21( 21-18)(21-10)(21-14)

= √( 21× 3 × 11 × 7)

= √4851

= 21√11

= 69.6 cm^2 approx