These are vertical angles, meaning they're always the same length.
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Answer:30 centimeters in 1 minute
<u>Answer:</u>
<u>Explanation:</u>
let the angle the ladder makes with the ground be θ
θ = cos⁻¹(3/20)
θ = cos⁻¹(0.15)
θ ≈ 81.37°