Answer:
12cm
Explanation:
The diagonal and the length and width form a triangle
Use pythagorous theorem
(15^2)- (9^2)
=144
find square root of 144cm
answer becomes 12cm
w = 12 cm
Pythagora
d² = l² + w²
w² = d² - l²
w = √(15cm)² - (9cm)²
= √225cm² - 81cm²
= √144cm²
= 12 cm
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