Question

find the value of a in the parallelogram.

a = 21
(type an integer or a decimal.)

ab = 22.1
(type an integer or a decimal.)

bc = \square
(type an integer or a decimal.)

Explanation:

Step1: Recall parallelogram side properties

In a parallelogram, opposite sides are equal. So \( BC = AD \) and \( AB = CD \), but here we need \( BC \), and \( BC = a - 3.5 \), we know \( a = 21 \).

Step2: Substitute \( a \) into \( BC \) formula

Substitute \( a = 21 \) into \( BC = a - 3.5 \), so \( BC = 21 - 3.5 \).

Step3: Calculate the value

\( 21 - 3.5 = 17.5 \).

Answer:

17.5