find the area of triangle two sids are 18cm and10cm and perimeter is 42cm
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Answered by
3
If two sides are 18cm and 10cm
and its perimeter=42
Then Perimeter= Sum of three sides
Let third side be x
42=18+10+x
42=28+x
x=42-28
×=14
And its semi perimeter be 21
So use Herons formulla to find area of a triangle
and its perimeter=42
Then Perimeter= Sum of three sides
Let third side be x
42=18+10+x
42=28+x
x=42-28
×=14
And its semi perimeter be 21
So use Herons formulla to find area of a triangle
Answered by
6
third side of a triangle is equal to = 42-28
= 14 cm
area according to heron's formula
area = √s(s-a)(s-b)(s-c)
√21(3)(11)(7)
= 7×3√11
= 21√11 cm² ans.
= 14 cm
area according to heron's formula
area = √s(s-a)(s-b)(s-c)
√21(3)(11)(7)
= 7×3√11
= 21√11 cm² ans.
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