ABC is a triangle with height of 4 cm and base of 7 cm,drawn to a scale of 1cm:3km. Find the actual area of the triangle.
How to solve such questions ?
Yes, that is correct. Skeeters point was this: A triangle with height 4 cm and base 7 cm has area (1/2)(4)(7)= 2(7)= 14 square cm. Since the scale is "1 cm to 3 km", and area is "length squared", that becomes 9*14 square km= 126 square km. Of course, the way you didn't is perfectly correct (and better than following someone else's method).