Question

one side of right angle triangular is 80 cm and its longest side is 1 m find its cost at rupees 250 per metre square

Answer 1

Area of triangle is
$1 \div 2\times a \times b \times \sin( \alpha )$
So.. Area of triangle will be... 0.40

As in 1 m sq. Rupee is 250
For 0.40sq.rupee will be.. 100

Answer 2

see the image sent.....