Question

Find semi perimeter of a triangle whose sides are 7cm,9cm and 8cm​

Answer 1

Answer:

12  √5  cm²

Step-by-step explanation:

Length of sides are 7 cm, 8 cm and 9 cm  

semi-perimeter = $\frac{(7+8+9)}{2}$ cm

S = 12cm

Using formula, Area of triangle  =  S √(S−a)(S−b)(S−c)  ,where a, b, c are sides of triangle  

=  √12×5×4×3

​=  4×4×3×3×5

​=12  √5  cm²

Answer 2

Answer:

26.832 sq.cm

S= 7 + 8 + 92= 242 = 12cm