Area of Triangles Sine Area Heron's Formula Box Method

The sides of a triangle are 56 cm, 60 cm and 52 cm long. Then the area of the triangle is

• (a) 1322 cm²

• (b) 1311 cm²

• (c) 1344 cm²

• (d) 1392 cm²

The area of an equilateral triangle with side 2√3 cm is

• 5.196 cm²

• 0.866 cm²

• 3.496 cm²

• 1.732 cm²

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

• 48 cm

• 24cm

• 12cm

• 36cm

The area of an isosceles triangle having base 2 cm and the length of one of the equal sides 4 cm is

• √15 cm²

• √15/2 cm²

• 215√5 cm²

• 4√15cm²

The edges of a triangular board are 6 cm, 8 cm and 10 cm. The cost of painting it at the rate of 9 paise per cm² is

• Rs 2.14

• Rs 2.16

• Rs 2.48

• Rs 2.80

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

• 168cm²

• 324cm²

• 336cm²

• 136cm²

The sides of a triangle are 16,30,34cm its area is

• 250cm²

• 260cm²

• 245cm²

• 240cm²

if the area of an isosceles right triangle is 8cm²

^{find its perimeter}

• 8

• 2+4√2cm²

• 4+4√2cm²

• 8+4√2cm²

if every side of a triangle is doubled then percentage increase of its area is

• 100%

• 200%

• 300%

• 400%

The length of each side of an equilateral triangle of area 4√3cm²

• 3cm²

• 4cm²

• 5cm²

• 6cm²