Question

the side of a triangle is equal to 8 centimetre, 15 cm and 17 cm find its area

Answer 1

Since 8^2+15^2=17^
Therefore it is a right angled ∆ .
Area = 1÷2×8×15 ( taking 15 cm as base )
= 60 sq.cm

Answer 2

le5 side a=8cm, side b=15cm and side c=17 CM

Now, Using herons formula
s(semi perimeter) =(a+b+c)/2
=(8+15+17)/2
=40/2
=20cm

NOW area of triangle =
$\sqrt{s{s - a} {s - b}{s - c}$
$\sqrt{20 \times {20 - 8} \times {20 - 15} \times {20 - 17}$
$\sqrt{2 \times 5 \times 2 \times 2 \times 3 \times 2 \times 5 \times 3}$
=
$2 \times 5 \times 2 \times 3$
$60answer$