Find the perimeters of the triangle whose sides are
i) $3$ cm, $4$ cm, $5$ cm
ii) $8$ , $9$ cm, $12$ cm
iii) $3.4$ cm, $4.3$ cm, $5.4$ cm

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Solution

Perimeter is the total length of the boundary.
A triangle have three sides and to find its perimeter.
We have to add all its side.

(a) Here the length of all the sides are given $3$ cm, $4$ cm, $5$ cm.

So, perimeter will be $3 + 4 + 5 = 12$ cm

(b) $8$ cm, $9$ cm, $12$ cm

Perimeter $= 8 + 9 + 12 = 29$ cm

(c) $3.4$ cm, $4.3$ cm, $5.4$ cm

Perimeter $= 3.4 + 4.3 + 5.4 = 13.1$ cm.

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(i) 3 c m, 4 c m, 5 c m (i i) 8 c m, 9 c m, 12 c m (i i i) 3.4 c m

The sides of certain triangles are given below. Determine which of them are right triangles.

(i) 9 cm, 16 cm, 18 cm

(ii) 7 cm, 24 cm, 25 cm

(iii) 1.4 cm, 4.8 cm, 5 cm

(iv) 1.6 cm, 3.8 cm, 4 cm

(v) (a-1) cm, $2 \sqrt{a} c m, (a + 1) c m$

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