Question

Cuboid b. Cube c. Pyramid d. Cylinder 5. The perimeter of a triangle of sides 12.1 cm, 8.9 cm and 10.3 cm is a.31.3 cm b. 33.1 cm c. 30.13 cm d. 13.3 cm ​

Answer 1

Step-by-step explanation:

. 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