Question

12+15+7 cm solution by heron formula

Answer 1

herons formula =a+b+c/2

so. = 12+15+7/2

= 34/2

answer = 17cm

Answer 2

Answer:

• let the sides be a,b,c

• first we will find semi perimeter by ÷
• s=a+b+c÷2
• i.e. 12+15+7÷2
• =34÷2 i.e. 17

1. now we will find the area by herons formula = under root S (s-a)(s-b)(s-c)
2. 17 (17-12)(17-15)(17-7)
3. 17×5×2×10
4. 17×5×2×5×2

• now we have factorised 10 i.e. 5×2 and now we will do the pairing.
• there are two pairs i.e. 5 and 2
• now we will take only one out them from the under root
• which means = 17×5×2
• = 170 sq.cm

hope that you got the concept and have a nice day .