Question

PLEASE need help with these

Answer 1

Answer:

63.72 ft^2

128 cm^2

Step-by-step explanation:

5.  The area of a triangle is

A = 1/2 bh  where b is the base and h is the height

A = 1/2(21.6) * (5.9)

   = 63.72 ft^2

6. The scale factor is 20/15 = 4/3

When we find area is the scale factor is squares

(4/3) ^2 = 16/9

Taking the ratio of the areas

A big trap

------------------- = scale factor squared

A little trap

A big trap     16

-------------- = ------

  72               9

Using cross products

9A = 16*72

9A = 1152

Divide each side by 9

A = 1152/9

A =128

The area of the large trapezoid is 128 cm^2