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Answered

.A 29-foot ladder leaning against the wall of a building is 21 feet from the base of the building. How high up the wall does the ladder reach?
A. 8 ft.
B. 9 ft.
C. 19 ft.
D. 20 ft.

Sagot :

Answer:

20 feet

Step-by-step explanation:

a² + b² = c²

a = 21 ft

c = 29 ft

b = ?

(21)² + b² = (29)²

441 + b² = 841 ⇒ b² = 841 - 441

√b² = √400

b = 20 feet

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