herons formula

The perimeter of an equilateral triangle is 60m.The area is

• $100\sqrt{3}\ m^2$

• $20\sqrt{3}\ m^2$

• 15 $\sqrt{3}\ m^2$

Find the area and perimeter of the right angle triangle whose hypotenuse is 5 cm and Base is 4 cm

• 6 cm² ,12 cm

• 12 cm² ,14 cm

• 4 cm², 6 cm

• 12 cm² ,6 cm

If the area of an equilateral triangle is 16√3 cm2, then the perimeter of the triangle is

• 48 cm

• 24 cm

• 12 cm

• 36 cm

One side of an equilateral triangle is 4 cm.  The area of the triangle is _______

• 16 √3 cm²

• 8 √3 cm²

• 4 √3 cm²

• √3 cm²

The perimeter of a triangle is 36cm and its sides are in the ration 3 : 4 : 5.  Then the sides are____

• 6 cm, 9 cm, 12 cm 

• 9 cm, 12 cm, 15 cm 

• 12 cm, 15 cm, 18 cm

• None of the above