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The area of triangle with given tow sides 18 cm and 10 cm respectively and perimeter equal to 42 cm

Posted by Supriya Pattanayak 3 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Punit Yadav 3 years, 11 months ago

Let the third side of triangle Be X cm. There for, Sum of all sides = perimeter 18+10+X= 42 X= 42-28 X= 14cm (third side of triangle) No for finding area of triangle we will use heron s formula First find the semi perimeter (s) S =(sum of all sides/2) S = (42/2) S = 21 ★ 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 Hence, the area of triangle is 21√11 cm². Option (d) is correct.

2Thank You

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CBSE > Class 09 > Mathematics