Question

Find the area of triangle whose sides are 3cm,5cm,7cm.

Answer 1

Answer:

Step-by-step explanation:

Given: the sides of a triangle are 3 cm, 5 cm and 4 cm.

To find out: Area of triangle

Solution:-

The lengths of the sides are a=3 cm, b=5 cm, c=4 cm.

∴s=  

2

a+b+2

​

=  

2

3+5+4

​

cm=6 cm

We use the formula,

Δ=  

s(s−a)(s−b)(s−c)

​

.

∴Δ=  

6(6−3)(6−5)(6−4)

​

cm  

2

 

=  

6×3×1×2

​

 sq.cm

=6 sq.cm

Answer 2

Answer:

15cm

Step-by-step explanation:

triangle= all side sum

3+5+7=15