Question

please tell fast and process​

Answer 1

Answer:

Step-by-step explanation:

Use phythagoreas theorem

in triangle ABC

$AB^{2} +BC^{2} =AC^{2} \\5^{2} +BC^{2} = 13^{2} \\BC^{2} = 13^{2} - 5^{2} \\BC^{2} = 169 - 25\\BC^{2} = 144\\BC = \sqrt{144} \\BC = 12 cm$

BC + CD = BD

12cm + CD = 17cm

CD = 17cm - 12cm

CD = 5cm

in triangle CDE

$ED^{2} +CD^{2} = EC^{2} \\ED^{2} +5^{2} =13^{2} \\ED^{2} = 169 - 25\\ED^{2} = 144\\ED = \sqrt{144}\\ED = 12 cm$