Question

find the area of a triangle which sides are 20cm,30cm,40cm​

Answer 1

Answer:

~ 285 cm²

Step-by-step explanation:

Heron's formula,

s = 45 cm

area = √s(s-a)(s-b)(s-c)

= √ 45×25×15×5

= √ 5×3×3×5×5×5×3×5

= 75√ 3×5

= 75 × 3.8

= 285 cm²