Question

If in triangle pqr, perimeter =43 cm, pq=25 and qr=31cm then find the are of triangle pqr

Answer 1

Answer:

77.95 cm is the area of triangle PQR

Step-by-step explanation:

We will apply Heron's formula Area = √p ( p - P )( p - Q )( p - R )

Where p represents half of the perimeter

⇒ p = 43/2 = 21.5

Now area of triangle = √21.5 ( 21.5 - 12 )( 21.5 - 13 )( 21.5 - 18 )

⇒ √21.5 ( 9.5 * 8.5 * 3.5 )

⇒ √6076.43 = 77.95