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