Question 19

Explanation

Given:

• Actual rectangle area = $810 \text{ m}^2$
• Actual width = $18 \text{ m}$
• Drawing scale = $3 : 90$

Finding the actual length

Use the rectangle area formula $A = p \times \ell$.

Finding the length in the drawing

The scale $3 : 90$ can be simplified to $1 : 30$, meaning every $1$ unit in the drawing represents $30$ units in reality.

Thus, the length in the drawing is $1.5 \text{ cm}$.