Question

the area of triangle with given two sides 18 cm and 120cm respectively.the area of the triangle is ?
​

Answer 1

Step-by-step explanation:

Given a=18 cm, b=10 cm

and perimeter =42 cm

semi- perimeters=

2

perimeter

=

2

42

s=21cm.

Area of triangle

∴c=42−(18+10)cm =14 cm

∴ Area of triangle=

21.(21−18)(21−10)(21−14)

=

21.3.7.11

cm

2

=

3×7×3×7×11

cm

2

=

(3×7)

2

×11

cm

2

=21

11

cm

2

∴ Thus, the required area of the triangle is

21

11

cm

2

Answer 2

Answer:

Step-by-step explanation:★ Formula = √s(s–a) (s–b) (s–c) ★

➛ √21 (21 – 18) (21 – 10) (21 – 14)

➛ √21 (3) (11) (7)

➛ √3  7  3  11  7

➛ 3  7 √11

➛ 21√11 cm²