QUESTION IMAGE
Question
1 fill in the blank 1 point what is the length of ad? type your answer...
Step1: Aplicar el Teorema de Pitágoras en el triángulo \( \triangle CBD \)
$$
BD=\sqrt{CD^{2}-BC^{2}}
$$
Sustituir \( CD = 20 \) y \( BC = 8.4 \):
$$
BD=\sqrt{20^{2}-8.4^{2}}=\sqrt{400 - 70.56}=\sqrt{329.44} = 18.15
$$
Step2: Aplicar el Teorema de Pitágoras en el triángulo \( \triangle ABD \)
$$
AD=\sqrt{AB^{2}+BD^{2}}
$$
Sustituir \( AB = 8.4 \) y \( BD = 18.15 \):
$$
AD=\sqrt{8.4^{2}+18.15^{2}}=\sqrt{70.56+329.44}=\sqrt{400}=20
$$
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\( 20 \)