Question

The sides of a triangle are 8cm,15cmand 17cm.find its perimeters and its area​

Answer 1

Step-by-step explanation:

Let a = 8cm, b = 15cm, c = 17cm 

s = (a + b + c)/2 = (8 + 15/ + 17)/2 = 40/2 = 20cm 

∴  Area = root under √s(s - a)(s - b)(s - c)

= root under √20(20 - 8)(20 - 15)(20 - 17)

= root under √20 x 12 x 5 x 3 = 60 cm2

Answer 2

Answer:

perimeter= 40 cm and area will be 60cm²

Step-by-step explanation:

perimeter= sum of all sides of the triangle

area of triangle=√s(s-a)(s-b)(s-c)

s is perimeter/2

√20×(20-8)(20-15)(20-17)=60 cm²