Question

Pls it is very urgent​

Answer 1

Let the unknown side be x

Perimeter = sum of sides

Thus, x + 20 +15 = 60

=> x = 25

Now, using herons formula to calculate the area of triangle

So, s = (25+20+15) /2 = 30

Area = √s(s-a)(s-b)(s-c)

=>√30(5)(10)(15)

=> √22500

=> 150 cm^2

Answer 2

Answer:

Let the unknown side be x

Perimeter = sum of sides

Thus, x + 20 +15 = 60

=> x = 25

Now, using herons formula to calculate the area of triangle

So, s = (25+20+15) /2 = 30

Area = √s(s-a)(s-b)(s-c)

=>√30(5)(10)(15)

=> √22500

=> 150 cm^2

I hope this answer help you