Question

Roohi painted the outside of her dolls-
house of measure 1.5m x 2m x 15m
How much surface area did she paint if
she painted all except the bottom of the
cabinet?​

Answer 1

Step-by-step explanation:

lb-2(bh+hl)

1.5×2 - 2(2×15 +15×1.5)

3-(60+22.5)

79.5m

Answer 2

Area She Painted = Total Surface Area of Cabinet - Bottom Area

⇒ Area She Painted = 2(lb + bh + hl) - (Length × Breadth)

⇒ Area She Painted = 2[(2 m × 1 m) + (1 m × 1.5 m) + (1.5 m × 2 m)] - (Length × Breadth)

⇒ Area She Painted = 2[(2 m²) + (1.5 m²) + (3 m²)] - (Length × Breadth)

⇒ Area She Painted = 2[2 m² + 1.5 m² + 3 m²] - (Length × Breadth)

⇒ Area She Painted = 2[6.5 m²] - (Length × Breadth)

⇒ Area She Painted =13 m² - (Length × Breadth)

⇒ Area She Painted =13 m² - (2 m × 1 m)

⇒ Area She Painted =13 m² - 2 m²

⇒ Area She Painted = 11 m²