ratio and proportion

**tinagreg13** · March 8th 2010, 07:53 AM

The measurements of 2 rectangles are:

(a) length 24cm and width 18cm.

(b) length 48cm and width 14cm.

Find:

(1) The ratio of their areas.

(2) The ratio of their perimeters.

please show all working out

**hollywood** · March 8th 2010, 10:51 AM

There's no trick - you have to calculate the area and perimeter of both rectangles and take the ratio:

(1) $\frac{\text{Area of a}}{\text{Area of b}} = \frac{\text{length of a * width of a}}{\text{length of b * width of b}}$

(2) $\frac{\text{Perimeter of a}}{\text{Perimeter of b}} = \frac{2*(\text{length of a + width of a})}{2*(\text{length of b + width of b})} = \frac{\text{length of a + width of a}}{\text{length of b + width of b}}$

I'll let you substitute the lengths and do the calculations.

Post again of you're still having trouble.

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