Five identical square tiles were pasted onto a rectangular wall shown .
- What is the area of the rectangular wall?
- What is the perimeter of the shaded part?
(a)
Length of each square tile
= 54 - 39
= 15
Length of the rectangle
= 21 + (4 x 15)
= 21 + 60
= 81
Area of the rectangular wall
= 81 x 54
= 4374 cm
2 (b)
Perimeter of the shaded part
= 54 + 54 + (81 - 15) + (81 - 15)
= 54 + 54 + 66 + 66
= 240 cm
Answer(s): (a) 4374 cm
2; (b) 240 cm