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KATRIN_1 [288]
3 years ago
7

PLEASE need help with these

Mathematics
1 answer:
Kryger [21]3 years ago
8 0

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

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