The area of an equilateral triangle is cm2. Its height is-

Q16 of 69 Page 240

The area of an equilateral triangle is cm². Its height is-

It is given in the question that,

Area of an equilateral triangle = 81 cm²

Let a be the side of the triangle and h be the height

We know that,

Area of an equilateral triangle =

81 =

a² = 81 × 4

a = 18

Also, Area of triangle =

h =

h = 9 cm

Hence, option (a) is correct

Each of the equal sides of an isosceles triangle is 13cm and base is 24cm. The area of the triangle is –

The base of a right triangle is 48 cm and its hypotenuse is 50 cm long. The area of the triangle is –

The difference between the semi- perimeter and the sides of a ∆ ABC are 8cm, 7cm and 5cm respectively. The area of the triangle is –

For an isosceles right angles triangle having each of equal sides ‘a’ , we have

I. Area =a²

II. Perimeter = (2 +)a

III. Hypotenuse = 2a

Which of the following is true?