The value of a by using the geometric mean (leg) theorem will be 2√70. Then the correct option is B.
What is the triangle?
A triangle is a three-sided polygon with three angles. The angles of the triangle add up to 180 degrees.
The triangle ΔACB and triangle ΔCDB are similar triangles.
Then the ratio of the corresponding sides will be constant.
20 / a = a / 14
a² = 14 x 20
a = √(14 x 5 x 4)
a = 2√70
Then the correct option is B.
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