Question

find area of a triangle whose sides are 7cm 8cm and 9cm​

Answer 1

Step-by-step explanation:

Area of the triangle = s(s−a)(s−b)(s−c)−−−−−−−−−−−−−−−−−√s(s−a)(s−b)(s−c)

s=a+b+c2s=a+b+c2

s=7+8+92=242s=7+8+92=242= 12 cm.

Area of the triagle =12(12−7)(12−8)(12−9)−−−−−−−−−−−−−−−−−−−−−√12(12−7)(12−8)(12−9)

=12×5×4×3−−−−−−−−−−−√=36×4×5−−−−−−−−√=6×25–√12×5×4×3=36×4×5=6×25

=6×2.236=12×2.236=26.832sq.cm