A closed wooden block is 25 cm long, 20 cm wide and 10 cm high. It stands on the floor with one of its 25 cm by 10 cm faces flat against a wall, so the base and that one face cannot be seen. Only the faces that can be seen are painted. Find the painted area in cm².

Question

Accepted Answer

1150. The whole surface = 2(25 × 20 + 25 × 10 + 20 × 10) = 2(500 + 250 + 200) = 1900 cm². Two faces are hidden: the base, 25 × 20 = 500 cm², and the face against the wall, 25 × 10 = 250 cm². Painted area = 1900 − 500 − 250 = 1150 cm².

A closed wooden block is 25 cm long, 20 cm wide and 10 cm high. It stands on the floor with one of its 25 cm by 10 cm faces flat against a wall, so the base and that one face cannot be seen. Only the faces that can be seen are painted. Find the painted area in $cm^{2}$ .

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More Areas & Volumes practice

A closed wooden block is 25 cm long, 20 cm wide and 10 cm high. It stands on the floor with one of its 25 cm by 10 cm faces flat against a wall, so the base and that one face cannot be seen. Only the faces that can be seen are painted. Find the painted area in cm2.

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Areas & Volumes practice

A closed wooden block is 25 cm long, 20 cm wide and 10 cm high. It stands on the floor with one of its 25 cm by 10 cm faces flat against a wall, so the base and that one face cannot be seen. Only the faces that can be seen are painted. Find the painted area in $cm^{2}$ .