The circumference of a circle of diameter 13 m is 13π m, about 40.82 m.
(40.82 m)/(2.5 m) = 16.328
16 may be the best approximation of the number of pieces Malia will need. 17 pieces will make a barrier that is longer (larger diameter) than is needed.
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The length of the ladder is 25 feet.
<u>Explanation:</u>
Height of the House, h = 24 feet
Distance between the house and the ladder, b = 7 feet
length of the ladder, x = ?
The house makes 90° with the base of the ladder.
Using pythagoras theorm,
x² = h² + b²
x² = (24)² + (7)²
x = √625
x = 25
Therefore, the length of the ladder is 25 feet.