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The area of a triangle with side 20cm, 34cm and 42cm is [[1]].

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answer is 336 C M 2.

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Detailed Solution

The area of a triangle with sides of 20cm, 34cm and 42cm are

336 c m 2

.
Let a=20cm, b=34cm and c=42cm.
We will use heron’s formula to find the area of this triangle.
First, we will find the semi perimeter that is s=

a + b + c 2

s = 20 + 34 + 42 2

s = 48 c m

Now, the area of triangle=

s (s − a) (s − b) (s − c)

= 48 (48 − 20) (48 − 34) (48 − 42)

= 48 (28) (14) (6)

= 112896

= 336 c m 2

Hence, the correct answer is

336 c m 2

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