If sides bd and d. c. have the same length , what is the length of side bc

Option 3rd is correct.

Step-by-step explanation:

Given: AB = AD = 1 unit   and BD = CD

We have to find, CB

In ΔABD,

using Pythagoras theorem

BD² = AB² + AD²

BD² = 1² + 1²

BD = ± √2

BD = √2   (length can not be negative)

CD = BD = √2

Again using Pythagoras theorem in ΔBDC

CB² = BD² + CD²

CB² = (√2)² + (√2)²

CB² = 2 + 2

CB² = 4

CB = 2

Therefore, Option 3rd is correct.

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

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step-by-step explanation: