Question

4. Find the perimeter of the triangle with given sides :
(I)12 cm, 13 cm, 15 cm
(iii) 8 cm, 12 cm, 14 cm
(ii) 6 cm, 6 cm, 5 cm
(iv) 6 cm, 5 cm, 10 cm​

Answer 1

Answer:

For an equilateral triangle with side ‘a’, area

∴ Each side of the triangle = a cm

∴ a + a + a = 180 cm

⇒ 3a = 180 cm

Now, s = Semi–perimeter

∴ Area of a triangle

∴ Area of the given triangle

Thus, the area of the given triangle

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Answer 2

ANSWER-1

perimeter of triangle=sum of all side

=12+13+15

=40cm

ANSWER-2

perimeter of triangle = 8+12+14

=34 cm

ANSWER-3

perimeter of triangle= 6+6+5

=17 cm

ANSWER-4

perimeter of triangle=6+5+10

=21 cm