Math, asked by sabana68702, 3 months ago

А
4cm
А-
4 cm
13
С E
8cm
perimeter of isosceles

Answers

Answered by Sanumarzi21
1

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

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ᴜ ғʀɴᴅ

Answered by nrjgupta984
1

Answer:

Hope it helps

Step-by-step explanation:

Sides are 4cm ,  4 cm  and perimeter  13 cm

perimeter of  Triangle is the sum of all the sides.

​However. Isosceles Triangle has two same sides i.e. 4 cm

Perimeter given as 13cm

13= 4+4+x

=> x= 13-8=5 cm    

Thus the isosceles triangle having two sides as 4 and perimeter as 13 has third side =5 cm

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