Question

If the sides of a triangle are 3 cm, 4 cm and 5 cm, then the area is 

Options

• 3 cm²

• 6 cm²

• 9 cm²

• 12 cm²

Answer 1

6 cm²

Explanation;

Hint:

a = 3 cm, b = 4 cm, c = 5 cm

s = `("a" + "b" + "c")/2`

= `(3 + 4 + 5)/2`

= 6 cm

Area of the triangle = `sqrt("s"("s" - "a")("s" - "b")("s" - "c"))`

= `sqrt(6 xx 3 xx 2 xx 1)`

= `sqrt(36)`

= 6 cm²