Question

3. Express the perimeter p of an isosceles triangle whose each equal side is k and the
given bys,
A
А е в B
unequal side is!
for finding the perimeter of the​

Answer 1

Answer:

Step-by-step explanation:

Area of triangle =  

S(S−a)(S−b)(S−c)

​  

 

Here S is the semi- perimeter, and a,b,c are sides of the triangle  

The given triangle is isosceles.

In isosceles triangle, two sides are equal

so, a=b=12 cm

and perimeter =30 cm

semi perimeter =  

2

perimeter

​  

 

S=  

2

30

​  

 

S=15 cm

We find C,

perimeter =30 cm

a+b+c=30 cm

⇒ 12+12+c=30 cm

⇒ 24+C=30 cm

⇒ C=30 cm −24 cm

⇒ C=6 cm.

Area of triangle =  

15(15−12)(15−12)(15−6)

​  

 

=  

15.3.3.9

​  

 

=  

15.9.9

​  

 

=  

9  

2

.15

​  

 

=9  

15

​  

 cm  

2

 

∴ Area of triangle = 9  

15

​  

 cm  

2

 

so, the answer is C−− 9  

15

​  

 cm  

2