A triangular signboard is repainted after every side is scaled up by the factor 1.25, so the new board is similar to the old one. Paint used is proportional to area, and the original board needed 240 mL. Find the paint needed for the enlarged board (in mL).

Question

Accepted Answer

375. Area factor = 1.25^2 = 1.5625, so the paint needed = 240 × 1.5625 = 375 mL. Using the length factor 1.25 by itself gives 300 mL, the commonest error; doubling gives 480 mL and dividing by 1.25 gives 192 mL.

A triangular signboard is repainted after every side is scaled up by the factor 1.25, so the new board is similar to the old one. Paint used is proportional to area, and the original board needed 240 mL.
Find the paint needed for the enlarged board (in mL).

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Areas of Similar Triangles practice

A triangular signboard is repainted after every side is scaled up by the factor 1.25, so the new board is similar to the old one. Paint used is proportional to area, and the original board needed 240 mL.Find the paint needed for the enlarged board (in mL).

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Areas of Similar Triangles practice

A triangular signboard is repainted after every side is scaled up by the factor 1.25, so the new board is similar to the old one. Paint used is proportional to area, and the original board needed 240 mL.
Find the paint needed for the enlarged board (in mL).